81088572 has 24 divisors (see below), whose sum is σ = 200336976. Its totient is φ = 25439488.

The previous prime is 81088541. The next prime is 81088573. The reversal of 81088572 is 27588018.

It is a self number, because there is not a number n which added to its sum of digits gives 81088572.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81088573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198543 + ... + 198950.

It is an arithmetic number, because the mean of its divisors is an integer number (8347374).

Almost surely, 2^81088572 is an apocalyptic number.

It is an amenable number.

81088572 is an abundant number, since it is smaller than the sum of its proper divisors (119248404).

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

81088572 is a wasteful number, since it uses less digits than its factorization.

81088572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397517 (or 397515 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 81088572 is about 9004.9193222372. The cubic root of 81088572 is about 432.8325209635.

The spelling of 81088572 in words is "eighty-one million, eighty-eight thousand, five hundred seventy-two".