28347904 has 40 divisors (see below), whose sum is σ = 61011720. Its totient is φ = 13080576.

The previous prime is 28347899. The next prime is 28347923. The reversal of 28347904 is 40974382.

It is a happy number.

It is a super-2 number, since 2×28347904² = 1607207322386432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4527 + ... + 8785.

It is an arithmetic number, because the mean of its divisors is an integer number (1525293).

Almost surely, 2^28347904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28347904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30505860).

28347904 is an abundant number, since it is smaller than the sum of its proper divisors (32663816).

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

28347904 is an equidigital number, since it uses as much as digits as its factorization.

28347904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4290 (or 4274 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 28347904 is about 5324.2749741162. The cubic root of 28347904 is about 304.9113923380.

The spelling of 28347904 in words is "twenty-eight million, three hundred forty-seven thousand, nine hundred four".