65231280 has 60 divisors (see below), whose sum is σ = 219070800. Its totient is φ = 17394816.

The previous prime is 65231273. The next prime is 65231297. The reversal of 65231280 is 8213256.

65231280 is a `hidden beast` number, since 652 + 3 + 1 + 2 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

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, 44580 + ... + 46019.

It is an arithmetic number, because the mean of its divisors is an integer number (3651180).

Almost surely, 2^65231280 is an apocalyptic number.

65231280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

65231280 is an abundant number, since it is smaller than the sum of its proper divisors (153839520).

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

65231280 is a wasteful number, since it uses less digits than its factorization.

65231280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90618 (or 90609 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 65231280 is about 8076.5883886701. The cubic root of 65231280 is about 402.5488900658.

The spelling of 65231280 in words is "sixty-five million, two hundred thirty-one thousand, two hundred eighty".