55999428 has 48 divisors (see below), whose sum is σ = 138991104. Its totient is φ = 17487360.

The previous prime is 55999393. The next prime is 55999439. The reversal of 55999428 is 82499955.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56013 + ... + 57003.

It is an arithmetic number, because the mean of its divisors is an integer number (2895648).

Almost surely, 2^55999428 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 55999428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69495552).

55999428 is an abundant number, since it is smaller than the sum of its proper divisors (82991676).

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

55999428 is a wasteful number, since it uses less digits than its factorization.

55999428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292 (or 1290 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 51.

The square root of 55999428 is about 7483.2765550927. The cubic root of 55999428 is about 382.5849339350.

The spelling of 55999428 in words is "fifty-five million, nine hundred ninety-nine thousand, four hundred twenty-eight".