65399616 has 56 divisors (see below), whose sum is σ = 192267840. Its totient is φ = 21799296.

The previous prime is 65399573. The next prime is 65399623. The reversal of 65399616 is 61699356.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17196 + ... + 20651.

Almost surely, 2^65399616 is an apocalyptic number.

It is an amenable number.

65399616 is an abundant number, since it is smaller than the sum of its proper divisors (126868224).

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

65399616 is a wasteful number, since it uses less digits than its factorization.

65399616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37868 (or 37852 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 65399616 is about 8087.0029058978. The cubic root of 65399616 is about 402.8948655099.

The spelling of 65399616 in words is "sixty-five million, three hundred ninety-nine thousand, six hundred sixteen".