551920428 has 18 divisors (see below), whose sum is σ = 1395132284. Its totient is φ = 183973464.

The previous prime is 551920427. The next prime is 551920463. The reversal of 551920428 is 824029155.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 15331123 = 551920428 / (5 + 5 + 1 + 9 + 2 + 0 + 4 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 551920392 and 551920401.

It is not an unprimeable number, because it can be changed into a prime (551920427) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 7665526 + ... + 7665597.

Almost surely, 2^551920428 is an apocalyptic number.

It is an amenable number.

551920428 is an abundant number, since it is smaller than the sum of its proper divisors (843211856).

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

551920428 is a wasteful number, since it uses less digits than its factorization.

551920428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15331133 (or 15331128 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 551920428 is about 23492.9867832934. The cubic root of 551920428 is about 820.2737674033.

The spelling of 551920428 in words is "five hundred fifty-one million, nine hundred twenty thousand, four hundred twenty-eight".