81553076 has 12 divisors (see below), whose sum is σ = 155692320. Its totient is φ = 37069560.

The previous prime is 81553019. The next prime is 81553081. The reversal of 81553076 is 67035518.

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, 926696 + ... + 926783.

It is an arithmetic number, because the mean of its divisors is an integer number (12974360).

Almost surely, 2^81553076 is an apocalyptic number.

It is an amenable number.

81553076 is a deficient number, since it is larger than the sum of its proper divisors (74139244).

81553076 is a wasteful number, since it uses less digits than its factorization.

81553076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1853494 (or 1853492 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 81553076 is about 9030.6741719542. The cubic root of 81553076 is about 433.6574204104.

The spelling of 81553076 in words is "eighty-one million, five hundred fifty-three thousand, seventy-six".