55775500 has 48 divisors (see below), whose sum is σ = 132900768. Its totient is φ = 20280000.

The previous prime is 55775413. The next prime is 55775509. The reversal of 55775500 is 557755.

It is a super-2 number, since 2×55775500² = 6221812800500000, which contains 22 as substring.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55775509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430 + ... + 10570.

It is an arithmetic number, because the mean of its divisors is an integer number (2768766).

Almost surely, 2^55775500 is an apocalyptic number.

55775500 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 55775500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66450384).

55775500 is an abundant number, since it is smaller than the sum of its proper divisors (77125268).

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

55775500 is a wasteful number, since it uses less digits than its factorization.

55775500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10171 (or 10159 counting only the distinct ones).

The product of its (nonzero) digits is 30625, while the sum is 34.

The square root of 55775500 is about 7468.2996726163. The cubic root of 55775500 is about 382.0742982041.

Multiplying 55775500 by its reverse (557755), we get a square (31109064002500 = 5577550²).

55775500 divided by its reverse (557755) gives a square (100 = 10²).

The spelling of 55775500 in words is "fifty-five million, seven hundred seventy-five thousand, five hundred".