65450640 has 160 divisors (see below), whose sum is σ = 215986176. Its totient is φ = 16360960.

The previous prime is 65450603. The next prime is 65450657. The reversal of 65450640 is 4605456.

65450640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 65450598 and 65450607.

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 31 ways as a sum of consecutive naturals, for example, 391837 + ... + 392003.

Almost surely, 2^65450640 is an apocalyptic number.

65450640 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 65450640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107993088).

65450640 is an abundant number, since it is smaller than the sum of its proper divisors (150535536).

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

65450640 is a wasteful number, since it uses less digits than its factorization.

65450640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 65450640 is about 8090.1569824077. The cubic root of 65450640 is about 402.9996161950. Note that the first 3 decimals are identical.

The spelling of 65450640 in words is "sixty-five million, four hundred fifty thousand, six hundred forty".