61861664 has 12 divisors (see below), whose sum is σ = 121790214. Its totient is φ = 30930816.

The previous prime is 61861627. The next prime is 61861687. The reversal of 61861664 is 46616816.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 55651600 + 6210064 = 7460^2 + 2492^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 966557 + ... + 966620.

Almost surely, 2^61861664 is an apocalyptic number.

It is an amenable number.

61861664 is a deficient number, since it is larger than the sum of its proper divisors (59928550).

61861664 is a wasteful number, since it uses less digits than its factorization.

61861664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933187 (or 1933179 counting only the distinct ones).

The product of its digits is 41472, while the sum is 38.

The square root of 61861664 is about 7865.2186237892. The cubic root of 61861664 is about 395.4945767680.

The spelling of 61861664 in words is "sixty-one million, eight hundred sixty-one thousand, six hundred sixty-four".