61881568 has 24 divisors (see below), whose sum is σ = 139234032. Its totient is φ = 26520576.

The previous prime is 61881557. The next prime is 61881571. The reversal of 61881568 is 86518816.

It is a happy number.

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, 137905 + ... + 138352.

It is an arithmetic number, because the mean of its divisors is an integer number (5801418).

Almost surely, 2^61881568 is an apocalyptic number.

It is an amenable number.

61881568 is an abundant number, since it is smaller than the sum of its proper divisors (77352464).

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

61881568 is a wasteful number, since it uses less digits than its factorization.

61881568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276274 (or 276266 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 61881568 is about 7866.4838396834. The cubic root of 61881568 is about 395.5369890335.

The spelling of 61881568 in words is "sixty-one million, eight hundred eighty-one thousand, five hundred sixty-eight".