551505728 has 14 divisors (see below), whose sum is σ = 1094394306. Its totient is φ = 275752832.

The previous prime is 551505709. The next prime is 551505739. The reversal of 551505728 is 827505155.

It can be written as a sum of positive squares in only one way, i.e., 442345024 + 109160704 = 21032^2 + 10448^2 .

It is a junction number, because it is equal to n+sod(n) for n = 551505691 and 551505700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4308575 + ... + 4308702.

Almost surely, 2^551505728 is an apocalyptic number.

It is an amenable number.

551505728 is a deficient number, since it is larger than the sum of its proper divisors (542888578).

551505728 is an equidigital number, since it uses as much as digits as its factorization.

551505728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8617289 (or 8617279 counting only the distinct ones).

The product of its (nonzero) digits is 70000, while the sum is 38.

The square root of 551505728 is about 23484.1590864991. The cubic root of 551505728 is about 820.0682711351.

The spelling of 551505728 in words is "five hundred fifty-one million, five hundred five thousand, seven hundred twenty-eight".