551589864 has 96 divisors (see below), whose sum is σ = 1673939520. Its totient is φ = 150737664.

The previous prime is 551589839. The next prime is 551589901. The reversal of 551589864 is 468985155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16852 + ... + 37244.

It is an arithmetic number, because the mean of its divisors is an integer number (17436870).

Almost surely, 2^551589864 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 551589864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (836969760).

551589864 is an abundant number, since it is smaller than the sum of its proper divisors (1122349656).

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

551589864 is a wasteful number, since it uses less digits than its factorization.

551589864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20439 (or 20428 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 51.

The square root of 551589864 is about 23485.9503533496. The cubic root of 551589864 is about 820.1099713703.

The spelling of 551589864 in words is "five hundred fifty-one million, five hundred eighty-nine thousand, eight hundred sixty-four".