61966864 has 10 divisors (see below), whose sum is σ = 120060830. Its totient is φ = 30983424.

The previous prime is 61966859. The next prime is 61966871. The reversal of 61966864 is 46866916.

It can be written as a sum of positive squares in only one way, i.e., 61465600 + 501264 = 7840^2 + 708^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1936449 + ... + 1936480.

It is an arithmetic number, because the mean of its divisors is an integer number (12006083).

Almost surely, 2^61966864 is an apocalyptic number.

It is an amenable number.

61966864 is a deficient number, since it is larger than the sum of its proper divisors (58093966).

61966864 is a wasteful number, since it uses less digits than its factorization.

61966864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3872937 (or 3872931 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The square root of 61966864 is about 7871.9034546925. The cubic root of 61966864 is about 395.7186383511.

The spelling of 61966864 in words is "sixty-one million, nine hundred sixty-six thousand, eight hundred sixty-four".