28939320 has 48 divisors (see below), whose sum is σ = 94053960. Its totient is φ = 7717056.

The previous prime is 28939307. The next prime is 28939331. The reversal of 28939320 is 2393982.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39834 + ... + 40553.

Almost surely, 2^28939320 is an apocalyptic number.

28939320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28939320 is an abundant number, since it is smaller than the sum of its proper divisors (65114640).

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

28939320 is a wasteful number, since it uses less digits than its factorization.

28939320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80404 (or 80397 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 28939320 is about 5379.5278603238. The cubic root of 28939320 is about 307.0172476667.

The spelling of 28939320 in words is "twenty-eight million, nine hundred thirty-nine thousand, three hundred twenty".