28864920 has 96 divisors (see below), whose sum is σ = 100753200. Its totient is φ = 6596352.

The previous prime is 28864903. The next prime is 28864939. The reversal of 28864920 is 2946882.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3426 + ... + 8334.

Almost surely, 2^28864920 is an apocalyptic number.

28864920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28864920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50376600).

28864920 is an abundant number, since it is smaller than the sum of its proper divisors (71888280).

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

28864920 is a wasteful number, since it uses less digits than its factorization.

28864920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4937 (or 4926 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The square root of 28864920 is about 5372.6083050973. The cubic root of 28864920 is about 306.7539186722.

The spelling of 28864920 in words is "twenty-eight million, eight hundred sixty-four thousand, nine hundred twenty".