65156040 has 144 divisors (see below), whose sum is σ = 221867100. Its totient is φ = 16563456.

The previous prime is 65156029. The next prime is 65156041. The reversal of 65156040 is 4065156.

It is a happy number.

65156040 is a `hidden beast` number, since 6 + 51 + 5 + 604 + 0 = 666.

65156040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 64931364 + 224676 = 8058^2 + 474^2 .

It is a junction number, because it is equal to n+sod(n) for n = 65155995 and 65156013.

It is not an unprimeable number, because it can be changed into a prime (65156041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 824721 + ... + 824799.

Almost surely, 2^65156040 is an apocalyptic number.

65156040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65156040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110933550).

65156040 is an abundant number, since it is smaller than the sum of its proper divisors (156711060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65156040 is a wasteful number, since it uses less digits than its factorization.

65156040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 65156040 is about 8071.9291374491. The cubic root of 65156040 is about 402.3940592804.

The spelling of 65156040 in words is "sixty-five million, one hundred fifty-six thousand, forty".