28387554 has 32 divisors (see below), whose sum is σ = 61375104. Its totient is φ = 8701440.

The previous prime is 28387531. The next prime is 28387561. The reversal of 28387554 is 45578382.

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 15 ways as a sum of consecutive naturals, for example, 27019 + ... + 28049.

It is an arithmetic number, because the mean of its divisors is an integer number (1917972).

Almost surely, 2^28387554 is an apocalyptic number.

28387554 is an abundant number, since it is smaller than the sum of its proper divisors (32987550).

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

28387554 is a wasteful number, since it uses less digits than its factorization.

28387554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402.

The product of its digits is 268800, while the sum is 42.

The square root of 28387554 is about 5327.9971846839. The cubic root of 28387554 is about 305.0534852005.

The spelling of 28387554 in words is "twenty-eight million, three hundred eighty-seven thousand, five hundred fifty-four".