28390624 has 24 divisors (see below), whose sum is σ = 56260008. Its totient is φ = 14102400.

The previous prime is 28390619. The next prime is 28390633. The reversal of 28390624 is 42609382.

It is a super-2 number, since 2×28390624² = 1612055062218752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28390624.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2199 + ... + 7849.

It is an arithmetic number, because the mean of its divisors is an integer number (2344167).

Almost surely, 2^28390624 is an apocalyptic number.

It is an amenable number.

28390624 is a deficient number, since it is larger than the sum of its proper divisors (27869384).

28390624 is a wasteful number, since it uses less digits than its factorization.

28390624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5818 (or 5810 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28390624 is about 5328.2852776480. The cubic root of 28390624 is about 305.0644815740.

The spelling of 28390624 in words is "twenty-eight million, three hundred ninety thousand, six hundred twenty-four".