66572690 has 16 divisors (see below), whose sum is σ = 123963480. Its totient is φ = 25710720.

The previous prime is 66572659. The next prime is 66572743. The reversal of 66572690 is 9627566.

It can be written as a sum of positive squares in 4 ways, for example, as 43943641 + 22629049 = 6629^2 + 4757^2 .

It is a super-2 number, since 2×66572690² = 8863846107672200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114491 + ... + 115070.

Almost surely, 2^66572690 is an apocalyptic number.

66572690 is a deficient number, since it is larger than the sum of its proper divisors (57390790).

66572690 is a wasteful number, since it uses less digits than its factorization.

66572690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229597.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 66572690 is about 8159.2089077312. The cubic root of 66572690 is about 405.2895150854.

The spelling of 66572690 in words is "sixty-six million, five hundred seventy-two thousand, six hundred ninety".