61631788 has 24 divisors (see below), whose sum is σ = 112039200. Its totient is φ = 29639808.

The previous prime is 61631747. The next prime is 61631819. The reversal of 61631788 is 88713616.

It is a self number, because there is not a number n which added to its sum of digits gives 61631788.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10833 + ... + 15511.

It is an arithmetic number, because the mean of its divisors is an integer number (4668300).

Almost surely, 2^61631788 is an apocalyptic number.

It is an amenable number.

61631788 is a deficient number, since it is larger than the sum of its proper divisors (50407412).

61631788 is a wasteful number, since it uses less digits than its factorization.

61631788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4809 (or 4807 counting only the distinct ones).

The product of its digits is 48384, while the sum is 40.

The square root of 61631788 is about 7850.5915700666. The cubic root of 61631788 is about 395.0040869096.

The spelling of 61631788 in words is "sixty-one million, six hundred thirty-one thousand, seven hundred eighty-eight".