55790280 has 288 divisors, whose sum is σ = 226100160. Its totient is φ = 11681280.

The previous prime is 55790263. The next prime is 55790321. The reversal of 55790280 is 8209755.

55790280 is a `hidden beast` number, since 5 + 579 + 0 + 2 + 80 = 666.

It is a super-2 number, since 2×55790280² = 6225110684956800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 425815 + ... + 425945.

It is an arithmetic number, because the mean of its divisors is an integer number (785070).

Almost surely, 2^55790280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55790280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113050080).

55790280 is an abundant number, since it is smaller than the sum of its proper divisors (170309880).

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

55790280 is a wasteful number, since it uses less digits than its factorization.

55790280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 55790280 is about 7469.2891228014. The cubic root of 55790280 is about 382.1080439610.

The spelling of 55790280 in words is "fifty-five million, seven hundred ninety thousand, two hundred eighty".