55042290 has 48 divisors (see below), whose sum is σ = 148051800. Its totient is φ = 14171136.

The previous prime is 55042283. The next prime is 55042327. The reversal of 55042290 is 9224055.

55042290 is a `hidden beast` number, since 550 + 4 + 22 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 54331641 + 710649 = 7371^2 + 843^2 .

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7935 + ... + 13154.

Almost surely, 2^55042290 is an apocalyptic number.

55042290 is an abundant number, since it is smaller than the sum of its proper divisors (93009510).

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

55042290 is a wasteful number, since it uses less digits than its factorization.

55042290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21131 (or 21128 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 55042290 is about 7419.0491304479. The cubic root of 55042290 is about 380.3926919287.

The spelling of 55042290 in words is "fifty-five million, forty-two thousand, two hundred ninety".