55331550 has 72 divisors (see below), whose sum is σ = 152334000. Its totient is φ = 14390400.

The previous prime is 55331543. The next prime is 55331599. The reversal of 55331550 is 5513355.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16951 + ... + 19949.

It is an arithmetic number, because the mean of its divisors is an integer number (2115750).

Almost surely, 2^55331550 is an apocalyptic number.

55331550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55331550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76167000).

55331550 is an abundant number, since it is smaller than the sum of its proper divisors (97002450).

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

55331550 is a wasteful number, since it uses less digits than its factorization.

55331550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3058 (or 3050 counting only the distinct ones).

The product of its (nonzero) digits is 5625, while the sum is 27.

The square root of 55331550 is about 7438.5179975584. The cubic root of 55331550 is about 381.0578786562.

The spelling of 55331550 in words is "fifty-five million, three hundred thirty-one thousand, five hundred fifty".