28920858 has 16 divisors (see below), whose sum is σ = 58042656. Its totient is φ = 9606800.

The previous prime is 28920833. The next prime is 28920863. The reversal of 28920858 is 85802982.

It is a Curzon number.

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, 6468 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (3627666).

Almost surely, 2^28920858 is an apocalyptic number.

28920858 is an abundant number, since it is smaller than the sum of its proper divisors (29121798).

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

28920858 is a wasteful number, since it uses less digits than its factorization.

28920858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16749.

The product of its (nonzero) digits is 92160, while the sum is 42.

The square root of 28920858 is about 5377.8116367162. The cubic root of 28920858 is about 306.9519459918.

The spelling of 28920858 in words is "twenty-eight million, nine hundred twenty thousand, eight hundred fifty-eight".