61931928 has 16 divisors (see below), whose sum is σ = 154829880. Its totient is φ = 20643968.

The previous prime is 61931927. The next prime is 61931981. The reversal of 61931928 is 82913916.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61931923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1290225 + ... + 1290272.

Almost surely, 2^61931928 is an apocalyptic number.

It is an amenable number.

61931928 is an abundant number, since it is smaller than the sum of its proper divisors (92897952).

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

61931928 is a wasteful number, since it uses less digits than its factorization.

61931928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580506 (or 2580502 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 61931928 is about 7869.6841105600. The cubic root of 61931928 is about 395.6442576023.

The spelling of 61931928 in words is "sixty-one million, nine hundred thirty-one thousand, nine hundred twenty-eight".