55422390 has 16 divisors (see below), whose sum is σ = 133013808. Its totient is φ = 14779296.

The previous prime is 55422379. The next prime is 55422407. The reversal of 55422390 is 9322455.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 1847413 = 55422390 / (5 + 5 + 4 + 2 + 2 + 3 + 9 + 0).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 923677 + ... + 923736.

It is an arithmetic number, because the mean of its divisors is an integer number (8313363).

Almost surely, 2^55422390 is an apocalyptic number.

55422390 is an abundant number, since it is smaller than the sum of its proper divisors (77591418).

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

55422390 is a wasteful number, since it uses less digits than its factorization.

55422390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1847423.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 55422390 is about 7444.6215484738. The cubic root of 55422390 is about 381.2662972519.

The spelling of 55422390 in words is "fifty-five million, four hundred twenty-two thousand, three hundred ninety".