8720577 has 12 divisors (see below), whose sum is σ = 12904164. Its totient is φ = 5671680.

The previous prime is 8720557. The next prime is 8720581. The reversal of 8720577 is 7750278.

8720577 is a `hidden beast` number, since 87 + 2 + 0 + 577 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4016016 + 4704561 = 2004^2 + 2169^2 .

It is not a de Polignac number, because 8720577 - 2⁶ = 8720513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8720557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11448 + ... + 12185.

It is an arithmetic number, because the mean of its divisors is an integer number (1075347).

Almost surely, 2^8720577 is an apocalyptic number.

It is an amenable number.

8720577 is a deficient number, since it is larger than the sum of its proper divisors (4183587).

8720577 is a wasteful number, since it uses less digits than its factorization.

8720577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23680 (or 23677 counting only the distinct ones).

The product of its (nonzero) digits is 27440, while the sum is 36.

The square root of 8720577 is about 2953.0623088584. The cubic root of 8720577 is about 205.8330330858.

Subtracting from 8720577 its reverse (7750278), we obtain a cube (970299 = 99³).

The spelling of 8720577 in words is "eight million, seven hundred twenty thousand, five hundred seventy-seven".