65390688 has 72 divisors (see below), whose sum is σ = 202869576. Its totient is φ = 19814400.

The previous prime is 65390681. The next prime is 65390783. The reversal of 65390688 is 88609356.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×65390688² = 8551884154226688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65390681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7153 + ... + 13488.

It is an arithmetic number, because the mean of its divisors is an integer number (2817633).

Almost surely, 2^65390688 is an apocalyptic number.

It is an amenable number.

65390688 is an abundant number, since it is smaller than the sum of its proper divisors (137478888).

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

65390688 is a wasteful number, since it uses less digits than its factorization.

65390688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20668 (or 20657 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 65390688 is about 8086.4508902237. The cubic root of 65390688 is about 402.8765310033.

The spelling of 65390688 in words is "sixty-five million, three hundred ninety thousand, six hundred eighty-eight".