28445904 has 100 divisors (see below), whose sum is σ = 84262464. Its totient is φ = 9260352.

The previous prime is 28445899. The next prime is 28445939. The reversal of 28445904 is 40954482.

28445904 is a `hidden beast` number, since 28 + 44 + 590 + 4 = 666.

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 19 ways as a sum of consecutive naturals, for example, 60679 + ... + 61145.

Almost surely, 2^28445904 is an apocalyptic number.

28445904 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 28445904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42131232).

28445904 is an abundant number, since it is smaller than the sum of its proper divisors (55816560).

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

28445904 is a wasteful number, since it uses less digits than its factorization.

28445904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 534 (or 519 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 28445904 is about 5333.4701649114. The cubic root of 28445904 is about 305.2623524271.

The spelling of 28445904 in words is "twenty-eight million, four hundred forty-five thousand, nine hundred four".