28940870 has 24 divisors (see below), whose sum is σ = 60599664. Its totient is φ = 9922416.

The previous prime is 28940797. The next prime is 28940881. The reversal of 28940870 is 7804982.

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, 29042 + ... + 30021.

It is an arithmetic number, because the mean of its divisors is an integer number (2524986).

Almost surely, 2^28940870 is an apocalyptic number.

28940870 is an abundant number, since it is smaller than the sum of its proper divisors (31658794).

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

28940870 is a wasteful number, since it uses less digits than its factorization.

28940870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59084 (or 59077 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28940870 is about 5379.6719230823. The cubic root of 28940870 is about 307.0227288855.

The spelling of 28940870 in words is "twenty-eight million, nine hundred forty thousand, eight hundred seventy".