55931904 has 264 divisors, whose sum is σ = 201097280. Its totient is φ = 15040512.

The previous prime is 55931899. The next prime is 55931963. The reversal of 55931904 is 40913955.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3290104 + ... + 3290120.

Almost surely, 2^55931904 is an apocalyptic number.

55931904 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55931904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100548640).

55931904 is an abundant number, since it is smaller than the sum of its proper divisors (145165376).

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

55931904 is a wasteful number, since it uses less digits than its factorization.

55931904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 55931904 is about 7478.7635341679. The cubic root of 55931904 is about 382.4310987004.

The spelling of 55931904 in words is "fifty-five million, nine hundred thirty-one thousand, nine hundred four".