61931888 has 20 divisors (see below), whose sum is σ = 120249000. Its totient is φ = 30899904.

The previous prime is 61931879. The next prime is 61931923. The reversal of 61931888 is 88813916.

It is a happy number.

It is a super-5 number, since 5×61931888⁵ (a number of 40 digits) contains 55555 as substring.

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, 4106 + ... + 11862.

It is an arithmetic number, because the mean of its divisors is an integer number (6012450).

Almost surely, 2^61931888 is an apocalyptic number.

It is an amenable number.

61931888 is a deficient number, since it is larger than the sum of its proper divisors (58317112).

61931888 is a wasteful number, since it uses less digits than its factorization.

61931888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8264 (or 8258 counting only the distinct ones).

The product of its digits is 82944, while the sum is 44.

The square root of 61931888 is about 7869.6815691615. The cubic root of 61931888 is about 395.6441724239.

The spelling of 61931888 in words is "sixty-one million, nine hundred thirty-one thousand, eight hundred eighty-eight".