28696920 has 128 divisors (see below), whose sum is σ = 99532800. Its totient is φ = 6483456.

The previous prime is 28696909. The next prime is 28696949. The reversal of 28696920 is 2969682.

It is a Harshad number since it is a multiple of its sum of digits (42).

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 31 ways as a sum of consecutive naturals, for example, 106546 + ... + 106814.

It is an arithmetic number, because the mean of its divisors is an integer number (777600).

Almost surely, 2^28696920 is an apocalyptic number.

28696920 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 28696920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49766400).

28696920 is an abundant number, since it is smaller than the sum of its proper divisors (70835880).

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

28696920 is a wasteful number, since it uses less digits than its factorization.

28696920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 413 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 28696920 is about 5356.9506251225. The cubic root of 28696920 is about 306.1576358973.

The spelling of 28696920 in words is "twenty-eight million, six hundred ninety-six thousand, nine hundred twenty".