55115784 has 24 divisors (see below), whose sum is σ = 149272110. Its totient is φ = 18371904.

The previous prime is 55115783. The next prime is 55115791. The reversal of 55115784 is 48751155.

It can be written as a sum of positive squares in only one way, i.e., 38713284 + 16402500 = 6222^2 + 4050^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55115783) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 382677 + ... + 382820.

Almost surely, 2^55115784 is an apocalyptic number.

It is an amenable number.

55115784 is an abundant number, since it is smaller than the sum of its proper divisors (94156326).

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

55115784 is a wasteful number, since it uses less digits than its factorization.

55115784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765509 (or 765502 counting only the distinct ones).

The product of its digits is 28000, while the sum is 36.

The square root of 55115784 is about 7424.0005387931. Note that the first 3 decimals coincide. The cubic root of 55115784 is about 380.5619202737.

The spelling of 55115784 in words is "fifty-five million, one hundred fifteen thousand, seven hundred eighty-four".