55640480 has 144 divisors (see below), whose sum is σ = 157199616. Its totient is φ = 18547200.

The previous prime is 55640477. The next prime is 55640509. The reversal of 55640480 is 8404655.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 368405 + ... + 368555.

It is an arithmetic number, because the mean of its divisors is an integer number (1091664).

Almost surely, 2^55640480 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55640480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78599808).

55640480 is an abundant number, since it is smaller than the sum of its proper divisors (101559136).

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

55640480 is a wasteful number, since it uses less digits than its factorization.

55640480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 212 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 55640480 is about 7459.2546544544. The cubic root of 55640480 is about 381.7657436403.

The spelling of 55640480 in words is "fifty-five million, six hundred forty thousand, four hundred eighty".