28081554 has 16 divisors (see below), whose sum is σ = 56261280. Its totient is φ = 9344160.

The previous prime is 28081523. The next prime is 28081589. The reversal of 28081554 is 45518082.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67 + ... + 7494.

It is an arithmetic number, because the mean of its divisors is an integer number (3516330).

Almost surely, 2^28081554 is an apocalyptic number.

28081554 is an abundant number, since it is smaller than the sum of its proper divisors (28179726).

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

28081554 is a wasteful number, since it uses less digits than its factorization.

28081554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8185.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 28081554 is about 5299.2031476440. The cubic root of 28081554 is about 303.9534280573.

The spelling of 28081554 in words is "twenty-eight million, eighty-one thousand, five hundred fifty-four".