81258572 has 12 divisors (see below), whose sum is σ = 150567480. Its totient is φ = 38239296.

The previous prime is 81258557. The next prime is 81258607. The reversal of 81258572 is 27585218.

It is a happy 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, 597422 + ... + 597557.

It is an arithmetic number, because the mean of its divisors is an integer number (12547290).

Almost surely, 2^81258572 is an apocalyptic number.

It is an amenable number.

81258572 is a deficient number, since it is larger than the sum of its proper divisors (69308908).

81258572 is a wasteful number, since it uses less digits than its factorization.

81258572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1195000 (or 1194998 counting only the distinct ones).

The product of its digits is 44800, while the sum is 38.

The square root of 81258572 is about 9014.3536651276. The cubic root of 81258572 is about 433.1347837279.

The spelling of 81258572 in words is "eighty-one million, two hundred fifty-eight thousand, five hundred seventy-two".