81079570 has 96 divisors (see below), whose sum is σ = 180169920. Its totient is φ = 25891200.

The previous prime is 81079549. The next prime is 81079597. The reversal of 81079570 is 7597018.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1374201 + ... + 1374259.

It is an arithmetic number, because the mean of its divisors is an integer number (1876770).

Almost surely, 2^81079570 is an apocalyptic number.

81079570 is an abundant number, since it is smaller than the sum of its proper divisors (99090350).

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

81079570 is a wasteful number, since it uses less digits than its factorization.

81079570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 81079570 is about 9004.4194704600. The cubic root of 81079570 is about 432.8165034884.

The spelling of 81079570 in words is "eighty-one million, seventy-nine thousand, five hundred seventy".