28288554 has 32 divisors (see below), whose sum is σ = 66748416. Its totient is φ = 7821360.

The previous prime is 28288541. The next prime is 28288571. The reversal of 28288554 is 45588282.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9562 + ... + 12165.

It is an arithmetic number, because the mean of its divisors is an integer number (2085888).

Almost surely, 2^28288554 is an apocalyptic number.

28288554 is an abundant number, since it is smaller than the sum of its proper divisors (38459862).

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

28288554 is a wasteful number, since it uses less digits than its factorization.

28288554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21770.

The product of its digits is 204800, while the sum is 42.

The square root of 28288554 is about 5318.6985250153. The cubic root of 28288554 is about 304.6984531973.

It can be divided in two parts, 2 and 8288554, that added together give a triangular number (8288556 = T₄₀₇₁).

The spelling of 28288554 in words is "twenty-eight million, two hundred eighty-eight thousand, five hundred fifty-four".