65140864 has 16 divisors (see below), whose sum is σ = 129773070. Its totient is φ = 32570368.

The previous prime is 65140861. The next prime is 65140871. The reversal of 65140864 is 46804156.

It can be written as a sum of positive squares in only one way, i.e., 46131264 + 19009600 = 6792^2 + 4360^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65140861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 254329 + ... + 254584.

Almost surely, 2^65140864 is an apocalyptic number.

65140864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

65140864 is a deficient number, since it is larger than the sum of its proper divisors (64632206).

65140864 is an equidigital number, since it uses as much as digits as its factorization.

65140864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508927 (or 508915 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 65140864 is about 8070.9890348086. The cubic root of 65140864 is about 402.3628152779.

The spelling of 65140864 in words is "sixty-five million, one hundred forty thousand, eight hundred sixty-four".