65139260 has 36 divisors (see below), whose sum is σ = 138583368. Its totient is φ = 25718688.

The previous prime is 65139251. The next prime is 65139299. The reversal of 65139260 is 6293156.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 212027 + ... + 212333.

It is an arithmetic number, because the mean of its divisors is an integer number (3849538).

Almost surely, 2^65139260 is an apocalyptic number.

It is an amenable number.

65139260 is an abundant number, since it is smaller than the sum of its proper divisors (73444108).

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

65139260 is a wasteful number, since it uses less digits than its factorization.

65139260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522 (or 417 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 65139260 is about 8070.8896659538. The cubic root of 65139260 is about 402.3595127158.

The spelling of 65139260 in words is "sixty-five million, one hundred thirty-nine thousand, two hundred sixty".