55442370 has 32 divisors (see below), whose sum is σ = 133257600. Its totient is φ = 14762880.

The previous prime is 55442369. The next prime is 55442377. The reversal of 55442370 is 7324455.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (55442377) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38931 + ... + 40329.

It is an arithmetic number, because the mean of its divisors is an integer number (4164300).

Almost surely, 2^55442370 is an apocalyptic number.

55442370 is an abundant number, since it is smaller than the sum of its proper divisors (77815230).

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

55442370 is a wasteful number, since it uses less digits than its factorization.

55442370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730.

The product of its (nonzero) digits is 16800, while the sum is 30.

The square root of 55442370 is about 7445.9633359291. The cubic root of 55442370 is about 381.3121077712.

It can be divided in two parts, 554 and 42370, that added together give a palindrome (42924).

The spelling of 55442370 in words is "fifty-five million, four hundred forty-two thousand, three hundred seventy".