65411640 has 192 divisors, whose sum is σ = 246317760. Its totient is φ = 14745600.

The previous prime is 65411627. The next prime is 65411651. The reversal of 65411640 is 4611456.

65411640 is a `hidden beast` number, since 6 + 5 + 4 + 11 + 640 = 666.

65411640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 254392 + ... + 254648.

It is an arithmetic number, because the mean of its divisors is an integer number (1282905).

Almost surely, 2^65411640 is an apocalyptic number.

65411640 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 65411640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123158880).

65411640 is an abundant number, since it is smaller than the sum of its proper divisors (180906120).

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

65411640 is a wasteful number, since it uses less digits than its factorization.

65411640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382 (or 375 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 65411640 is about 8087.7462868218. The cubic root of 65411640 is about 402.9195553134.

The spelling of 65411640 in words is "sixty-five million, four hundred eleven thousand, six hundred forty".