55224280 has 16 divisors (see below), whose sum is σ = 124254720. Its totient is φ = 22089696.

The previous prime is 55224277. The next prime is 55224287. The reversal of 55224280 is 8242255.

It is a super-2 number, since 2×55224280² = 6099442203036800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55224287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690264 + ... + 690343.

It is an arithmetic number, because the mean of its divisors is an integer number (7765920).

Almost surely, 2^55224280 is an apocalyptic number.

It is an amenable number.

55224280 is an abundant number, since it is smaller than the sum of its proper divisors (69030440).

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

55224280 is a wasteful number, since it uses less digits than its factorization.

55224280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380618 (or 1380614 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 55224280 is about 7431.3040578353. The cubic root of 55224280 is about 380.8114699779.

The spelling of 55224280 in words is "fifty-five million, two hundred twenty-four thousand, two hundred eighty".