55507500 has 90 divisors (see below), whose sum is σ = 175403228. Its totient is φ = 14796000.

The previous prime is 55507489. The next prime is 55507513. The reversal of 55507500 is 570555.

It is a tau number, because it is divible by the number of its divisors (90).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 21267 + ... + 23733.

Almost surely, 2^55507500 is an apocalyptic number.

55507500 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 55507500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87701614).

55507500 is an abundant number, since it is smaller than the sum of its proper divisors (119895728).

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

55507500 is a wasteful number, since it uses less digits than its factorization.

55507500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2497 (or 2477 counting only the distinct ones).

The product of its (nonzero) digits is 4375, while the sum is 27.

The square root of 55507500 is about 7450.3355629126. The cubic root of 55507500 is about 381.4613626891.

The spelling of 55507500 in words is "fifty-five million, five hundred seven thousand, five hundred".