55640484 has 18 divisors (see below), whose sum is σ = 140646870. Its totient is φ = 18546816.

The previous prime is 55640477. The next prime is 55640509. The reversal of 55640484 is 48404655.

55640484 is a `hidden beast` number, since 5 + 5 + 640 + 4 + 8 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 1617984 = 7350^2 + 1272^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1545569 = 55640484 / (5 + 5 + 6 + 4 + 0 + 4 + 8 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 772749 + ... + 772820.

It is an arithmetic number, because the mean of its divisors is an integer number (7813715).

Almost surely, 2^55640484 is an apocalyptic number.

It is an amenable number.

55640484 is an abundant number, since it is smaller than the sum of its proper divisors (85006386).

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

55640484 is a wasteful number, since it uses less digits than its factorization.

55640484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545579 (or 1545574 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

The square root of 55640484 is about 7459.2549225777. The cubic root of 55640484 is about 381.7657527887.

The spelling of 55640484 in words is "fifty-five million, six hundred forty thousand, four hundred eighty-four".