55999164 has 72 divisors (see below), whose sum is σ = 144435312. Its totient is φ = 16872960.

The previous prime is 55999157. The next prime is 55999211. The reversal of 55999164 is 46199955.

It is a plaindrome in base 16.

It is a congruent number.

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, 107224 + ... + 107744.

It is an arithmetic number, because the mean of its divisors is an integer number (2006046).

Almost surely, 2^55999164 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 55999164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72217656).

55999164 is an abundant number, since it is smaller than the sum of its proper divisors (88436148).

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

55999164 is a wasteful number, since it uses less digits than its factorization.

55999164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 592 counting only the distinct ones).

The product of its digits is 437400, while the sum is 48.

The square root of 55999164 is about 7483.2589157399. The cubic root of 55999164 is about 382.5843327230.

The spelling of 55999164 in words is "fifty-five million, nine hundred ninety-nine thousand, one hundred sixty-four".