28914920 has 32 divisors (see below), whose sum is σ = 66575520. Its totient is φ = 11296320.

The previous prime is 28914901. The next prime is 28914929. The reversal of 28914920 is 2941982.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28914929) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6686 + ... + 10125.

It is an arithmetic number, because the mean of its divisors is an integer number (2080485).

Almost surely, 2^28914920 is an apocalyptic number.

28914920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28914920 is an abundant number, since it is smaller than the sum of its proper divisors (37660600).

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

28914920 is a wasteful number, since it uses less digits than its factorization.

28914920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16865 (or 16861 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 28914920 is about 5377.2595250741. The cubic root of 28914920 is about 306.9309368708.

The spelling of 28914920 in words is "twenty-eight million, nine hundred fourteen thousand, nine hundred twenty".