28745886 has 24 divisors (see below), whose sum is σ = 62256600. Its totient is φ = 8844576.

The previous prime is 28745839. The next prime is 28745891. The reversal of 28745886 is 68854782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13161 + ... + 15188.

It is an arithmetic number, because the mean of its divisors is an integer number (2594025).

Almost surely, 2^28745886 is an apocalyptic number.

28745886 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28745886 is an abundant number, since it is smaller than the sum of its proper divisors (33510714).

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

28745886 is a wasteful number, since it uses less digits than its factorization.

28745886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28380 (or 28367 counting only the distinct ones).

The product of its digits is 860160, while the sum is 48.

The square root of 28745886 is about 5361.5190011787. The cubic root of 28745886 is about 306.3316707906.

The spelling of 28745886 in words is "twenty-eight million, seven hundred forty-five thousand, eight hundred eighty-six".