55717500 has 240 divisors, whose sum is σ = 188939520. Its totient is φ = 12672000.

The previous prime is 55717457. The next prime is 55717511. The reversal of 55717500 is 571755.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2422489 + ... + 2422511.

It is an arithmetic number, because the mean of its divisors is an integer number (787248).

Almost surely, 2^55717500 is an apocalyptic number.

55717500 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 55717500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94469760).

55717500 is an abundant number, since it is smaller than the sum of its proper divisors (133222020).

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

55717500 is a wasteful number, since it uses less digits than its factorization.

55717500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 6125, while the sum is 30.

The square root of 55717500 is about 7464.4155832858. The cubic root of 55717500 is about 381.9418147355.

The spelling of 55717500 in words is "fifty-five million, seven hundred seventeen thousand, five hundred".