55644140 has 24 divisors (see below), whose sum is σ = 117181680. Its totient is φ = 22195008.

The previous prime is 55644137. The next prime is 55644143. The reversal of 55644140 is 4144655.

It is an interprime number because it is at equal distance from previous prime (55644137) and next prime (55644143).

It is not an unprimeable number, because it can be changed into a prime (55644143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3731 + ... + 11189.

It is an arithmetic number, because the mean of its divisors is an integer number (4882570).

Almost surely, 2^55644140 is an apocalyptic number.

It is a pronic number, being equal to 7459×7460.

It is an amenable number.

55644140 is an abundant number, since it is smaller than the sum of its proper divisors (61537540).

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

55644140 is a wasteful number, since it uses less digits than its factorization.

55644140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7841 (or 7839 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 55644140 is about 7459.4999832428. The cubic root of 55644140 is about 381.7741142366.

Adding to 55644140 its reverse (4144655), we get a palindrome (59788795).

The spelling of 55644140 in words is "fifty-five million, six hundred forty-four thousand, one hundred forty".