81080764 has 24 divisors (see below), whose sum is σ = 146663888. Its totient is φ = 39191040.

The previous prime is 81080749. The next prime is 81080807. The reversal of 81080764 is 46708018.

It is a happy number.

It is a nialpdrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22444 + ... + 25804.

Almost surely, 2^81080764 is an apocalyptic number.

It is an amenable number.

81080764 is a deficient number, since it is larger than the sum of its proper divisors (65583124).

81080764 is a wasteful number, since it uses less digits than its factorization.

81080764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3565 (or 3563 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 81080764 is about 9004.4857709921. The cubic root of 81080764 is about 432.8186280695.

The spelling of 81080764 in words is "eighty-one million, eighty thousand, seven hundred sixty-four".