81102572 has 12 divisors (see below), whose sum is σ = 146508096. Its totient is φ = 39243120.

The previous prime is 81102559. The next prime is 81102587. The reversal of 81102572 is 27520118.

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, 326903 + ... + 327150.

It is an arithmetic number, because the mean of its divisors is an integer number (12209008).

Almost surely, 2^81102572 is an apocalyptic number.

It is an amenable number.

81102572 is a deficient number, since it is larger than the sum of its proper divisors (65405524).

81102572 is a wasteful number, since it uses less digits than its factorization.

81102572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654088 (or 654086 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 81102572 is about 9005.6966415708. The cubic root of 81102572 is about 432.8574291449.

The spelling of 81102572 in words is "eighty-one million, one hundred two thousand, five hundred seventy-two".