28769904 has 100 divisors (see below), whose sum is σ = 84622560. Its totient is φ = 9434880.

The previous prime is 28769893. The next prime is 28769911. The reversal of 28769904 is 40996782.

It is a happy number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 28769904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 102244 + ... + 102524.

Almost surely, 2^28769904 is an apocalyptic number.

28769904 is a gapful number since it is divisible by the number (24) 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 28769904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42311280).

28769904 is an abundant number, since it is smaller than the sum of its proper divisors (55852656).

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

28769904 is a wasteful number, since it uses less digits than its factorization.

28769904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 28769904 is about 5363.7583838201. The cubic root of 28769904 is about 306.4169632958.

The spelling of 28769904 in words is "twenty-eight million, seven hundred sixty-nine thousand, nine hundred four".