81058576 has 10 divisors (see below), whose sum is σ = 157051022. Its totient is φ = 40529280.

The previous prime is 81058573. The next prime is 81058633. The reversal of 81058576 is 67585018.

It can be written as a sum of positive squares in only one way, i.e., 80568576 + 490000 = 8976^2 + 700^2 .

It is not an unprimeable number, because it can be changed into a prime (81058573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2533065 + ... + 2533096.

Almost surely, 2^81058576 is an apocalyptic number.

It is an amenable number.

81058576 is a deficient number, since it is larger than the sum of its proper divisors (75992446).

81058576 is a wasteful number, since it uses less digits than its factorization.

81058576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5066169 (or 5066163 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 81058576 is about 9003.2536341036. The cubic root of 81058576 is about 432.7791437521.

The spelling of 81058576 in words is "eighty-one million, fifty-eight thousand, five hundred seventy-six".