55120640 has 36 divisors (see below), whose sum is σ = 132034224. Its totient is φ = 22047744.

The previous prime is 55120633. The next prime is 55120669. The reversal of 55120640 is 4602155.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20252 + ... + 22811.

Almost surely, 2^55120640 is an apocalyptic number.

It is an amenable number.

55120640 is an abundant number, since it is smaller than the sum of its proper divisors (76913584).

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

55120640 is an equidigital number, since it uses as much as digits as its factorization.

55120640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43084 (or 43070 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 55120640 is about 7424.3275789798. The cubic root of 55120640 is about 380.5730964697.

Adding to 55120640 its reverse (4602155), we get a palindrome (59722795).

The spelling of 55120640 in words is "fifty-five million, one hundred twenty thousand, six hundred forty".