551985478 has 32 divisors (see below), whose sum is σ = 989379360. Its totient is φ = 227996160.

The previous prime is 551985457. The next prime is 551985479. The reversal of 551985478 is 874589155.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551985479) 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, 14601 + ... + 36292.

It is an arithmetic number, because the mean of its divisors is an integer number (30918105).

Almost surely, 2^551985478 is an apocalyptic number.

551985478 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

551985478 is a deficient number, since it is larger than the sum of its proper divisors (437393882).

551985478 is a wasteful number, since it uses less digits than its factorization.

551985478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50952.

The product of its digits is 2016000, while the sum is 52.

The square root of 551985478 is about 23494.3711982253. The cubic root of 551985478 is about 820.3059922855.

The spelling of 551985478 in words is "five hundred fifty-one million, nine hundred eighty-five thousand, four hundred seventy-eight".