61657564 has 12 divisors (see below), whose sum is σ = 107965144. Its totient is φ = 30810384.

The previous prime is 61657559. The next prime is 61657579. The reversal of 61657564 is 46575616.

It is a super-5 number, since 5×61657564⁵ (a number of 40 digits) contains 55555 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent 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, 5314 + ... + 12310.

Almost surely, 2^61657564 is an apocalyptic number.

It is an amenable number.

61657564 is a deficient number, since it is larger than the sum of its proper divisors (46307580).

61657564 is a wasteful number, since it uses less digits than its factorization.

61657564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9204 (or 9202 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 61657564 is about 7852.2330581816. The cubic root of 61657564 is about 395.0591461931.

The spelling of 61657564 in words is "sixty-one million, six hundred fifty-seven thousand, five hundred sixty-four".