55731500 has 48 divisors (see below), whose sum is σ = 132795936. Its totient is φ = 20264000.

The previous prime is 55731449. The next prime is 55731523. The reversal of 55731500 is 513755.

It is a self number, because there is not a number n which added to its sum of digits gives 55731500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434 + ... + 10566.

It is an arithmetic number, because the mean of its divisors is an integer number (2766582).

Almost surely, 2^55731500 is an apocalyptic number.

55731500 is a gapful number since it is divisible by the number (50) 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 55731500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66397968).

55731500 is an abundant number, since it is smaller than the sum of its proper divisors (77064436).

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

55731500 is a wasteful number, since it uses less digits than its factorization.

55731500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10163 (or 10151 counting only the distinct ones).

The product of its (nonzero) digits is 2625, while the sum is 26.

The square root of 55731500 is about 7465.3533071115. The cubic root of 55731500 is about 381.9738019185.

The spelling of 55731500 in words is "fifty-five million, seven hundred thirty-one thousand, five hundred".