55091040 has 48 divisors (see below), whose sum is σ = 173538288. Its totient is φ = 14690816.

The previous prime is 55091027. The next prime is 55091077. The reversal of 55091040 is 4019055.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 55091040.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56907 + ... + 57866.

It is an arithmetic number, because the mean of its divisors is an integer number (3615381).

Almost surely, 2^55091040 is an apocalyptic number.

It is an amenable number.

55091040 is an abundant number, since it is smaller than the sum of its proper divisors (118447248).

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

55091040 is a wasteful number, since it uses less digits than its factorization.

55091040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114791 (or 114783 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 55091040 is about 7422.3338647625. Note that the first 3 decimals coincide. The cubic root of 55091040 is about 380.5049611898.

The spelling of 55091040 in words is "fifty-five million, ninety-one thousand, forty".