81652764 has 12 divisors (see below), whose sum is σ = 190523144. Its totient is φ = 27217584.

The previous prime is 81652759. The next prime is 81652787. The reversal of 81652764 is 46725618.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3402187 + ... + 3402210.

Almost surely, 2^81652764 is an apocalyptic number.

It is an amenable number.

81652764 is an abundant number, since it is smaller than the sum of its proper divisors (108870380).

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

81652764 is a wasteful number, since it uses less digits than its factorization.

81652764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804404 (or 6804402 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 81652764 is about 9036.1918970327. The cubic root of 81652764 is about 433.8340450107.

The spelling of 81652764 in words is "eighty-one million, six hundred fifty-two thousand, seven hundred sixty-four".