61642864 has 20 divisors (see below), whose sum is σ = 123552360. Its totient is φ = 29758400.

The previous prime is 61642853. The next prime is 61642891. The reversal of 61642864 is 46824616.

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, 65962 + ... + 66889.

It is an arithmetic number, because the mean of its divisors is an integer number (6177618).

Almost surely, 2^61642864 is an apocalyptic number.

It is an amenable number.

61642864 is an abundant number, since it is smaller than the sum of its proper divisors (61909496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61642864 is a wasteful number, since it uses less digits than its factorization.

61642864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132888 (or 132882 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 61642864 is about 7851.2969629228. The cubic root of 61642864 is about 395.0277478771.

The spelling of 61642864 in words is "sixty-one million, six hundred forty-two thousand, eight hundred sixty-four".