55213550 has 48 divisors (see below), whose sum is σ = 119031072. Its totient is φ = 18662400.

The previous prime is 55213549. The next prime is 55213567. The reversal of 55213550 is 5531255.

It is a super-2 number, since 2×55213550² = 6097072207205000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24470 + ... + 26630.

It is an arithmetic number, because the mean of its divisors is an integer number (2479814).

Almost surely, 2^55213550 is an apocalyptic number.

55213550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55213550 is an abundant number, since it is smaller than the sum of its proper divisors (63817522).

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

55213550 is a wasteful number, since it uses less digits than its factorization.

55213550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253 (or 2248 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 26.

The square root of 55213550 is about 7430.5820767959. The cubic root of 55213550 is about 380.7868046692.

The spelling of 55213550 in words is "fifty-five million, two hundred thirteen thousand, five hundred fifty".