55442644 has 12 divisors (see below), whose sum is σ = 102732084. Its totient is φ = 26090624.

The previous prime is 55442641. The next prime is 55442669. The reversal of 55442644 is 44624455.

It can be written as a sum of positive squares in 2 ways, for example, as 17472400 + 37970244 = 4180^2 + 6162^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55442641) 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, 407599 + ... + 407734.

It is an arithmetic number, because the mean of its divisors is an integer number (8561007).

Almost surely, 2^55442644 is an apocalyptic number.

It is an amenable number.

55442644 is a deficient number, since it is larger than the sum of its proper divisors (47289440).

55442644 is a wasteful number, since it uses less digits than its factorization.

55442644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815354 (or 815352 counting only the distinct ones).

The product of its digits is 76800, while the sum is 34.

The square root of 55442644 is about 7445.9817351374. The cubic root of 55442644 is about 381.3127359270.

The spelling of 55442644 in words is "fifty-five million, four hundred forty-two thousand, six hundred forty-four".