61572290 has 16 divisors (see below), whose sum is σ = 119355768. Its totient is φ = 22734336.

The previous prime is 61572271. The next prime is 61572319. The reversal of 61572290 is 9227516.

It can be written as a sum of positive squares in 4 ways, for example, as 56505289 + 5067001 = 7517^2 + 2251^2 .

It is a super-2 number, since 2×61572290² = 7582293791688200, 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, 236687 + ... + 236946.

Almost surely, 2^61572290 is an apocalyptic number.

61572290 is a deficient number, since it is larger than the sum of its proper divisors (57783478).

61572290 is a wasteful number, since it uses less digits than its factorization.

61572290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473653.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 61572290 is about 7846.8012591119. The cubic root of 61572290 is about 394.8769365069.

The spelling of 61572290 in words is "sixty-one million, five hundred seventy-two thousand, two hundred ninety".