28745808 has 80 divisors (see below), whose sum is σ = 91410816. Its totient is φ = 7580160.

The previous prime is 28745779. The next prime is 28745819. The reversal of 28745808 is 80854782.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28745808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1078 + ... + 7658.

Almost surely, 2^28745808 is an apocalyptic number.

28745808 is a gapful number since it is divisible by the number (28) 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 28745808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45705408).

28745808 is an abundant number, since it is smaller than the sum of its proper divisors (62665008).

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

28745808 is a wasteful number, since it uses less digits than its factorization.

28745808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6612 (or 6606 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 28745808 is about 5361.5117271158. The cubic root of 28745808 is about 306.3313937203.

The spelling of 28745808 in words is "twenty-eight million, seven hundred forty-five thousand, eight hundred eight".