28451556 has 81 divisors (see below), whose sum is σ = 84325059. Its totient is φ = 8065008.

The previous prime is 28451539. The next prime is 28451567. The reversal of 28451556 is 65515482.

The square root of 28451556 is 5334.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×28451556² = 1618982077642272, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28451556.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 223965 + ... + 224091.

Almost surely, 2^28451556 is an apocalyptic number.

28451556 is the 5334-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28451556

28451556 is an abundant number, since it is smaller than the sum of its proper divisors (55873503).

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

28451556 is a wasteful number, since it uses less digits than its factorization.

28451556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 139 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

The cubic root of 28451556 is about 305.2825689119.

Multiplying 28451556 by its sum of digits (36), we get a square (1024256016 = 32004²).

28451556 divided by its sum of digits (36) gives a square (790321 = 889²).

It can be divided in two parts, 28 and 451556, that added together give a square (451584 = 672²).

The spelling of 28451556 in words is "twenty-eight million, four hundred fifty-one thousand, five hundred fifty-six".