28551816 has 48 divisors (see below), whose sum is σ = 77576460. Its totient is φ = 9486720.

The previous prime is 28551797. The next prime is 28551829. The reversal of 28551816 is 61815582.

28551816 is a `hidden beast` number, since 28 + 551 + 81 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 26563716 + 1988100 = 5154^2 + 1410^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38586 + ... + 39318.

Almost surely, 2^28551816 is an apocalyptic number.

It is an amenable number.

28551816 is an abundant number, since it is smaller than the sum of its proper divisors (49024644).

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

28551816 is a wasteful number, since it uses less digits than its factorization.

28551816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 1279 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 28551816 is about 5343.3899352377. The cubic root of 28551816 is about 305.6407420348.

The spelling of 28551816 in words is "twenty-eight million, five hundred fifty-one thousand, eight hundred sixteen".