28904344 has 32 divisors (see below), whose sum is σ = 63453600. Its totient is φ = 12084480.

The previous prime is 28904341. The next prime is 28904347. The reversal of 28904344 is 44340982.

28904344 = T₂₄₅ + T₂₄₆ + ... + T₅₇₂.

It is an interprime number because it is at equal distance from previous prime (28904341) and next prime (28904347).

It is a super-2 number, since 2×28904344² = 1670922204140672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28904341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3999 + ... + 8590.

It is an arithmetic number, because the mean of its divisors is an integer number (1982925).

Almost surely, 2^28904344 is an apocalyptic number.

It is an amenable number.

28904344 is an abundant number, since it is smaller than the sum of its proper divisors (34549256).

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

28904344 is a wasteful number, since it uses less digits than its factorization.

28904344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12643 (or 12639 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 28904344 is about 5376.2760345801. The cubic root of 28904344 is about 306.8935110086.

The spelling of 28904344 in words is "twenty-eight million, nine hundred four thousand, three hundred forty-four".