55158940 has 48 divisors (see below), whose sum is σ = 119768544. Its totient is φ = 21324800.

The previous prime is 55158913. The next prime is 55158947. The reversal of 55158940 is 4985155.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 55158940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55158947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112095 + ... + 112585.

It is an arithmetic number, because the mean of its divisors is an integer number (2495178).

Almost surely, 2^55158940 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 55158940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59884272).

55158940 is an abundant number, since it is smaller than the sum of its proper divisors (64609604).

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

55158940 is a wasteful number, since it uses less digits than its factorization.

55158940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 37.

The square root of 55158940 is about 7426.9064892457. The cubic root of 55158940 is about 380.6612218066.

The spelling of 55158940 in words is "fifty-five million, one hundred fifty-eight thousand, nine hundred forty".