28578416 has 20 divisors (see below), whose sum is σ = 55891512. Its totient is φ = 14154816.

The previous prime is 28578409. The next prime is 28578421. The reversal of 28578416 is 61487582.

It is a super-2 number, since 2×28578416² = 1633451722138112, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

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, 6635 + ... + 10058.

Almost surely, 2^28578416 is an apocalyptic number.

It is an amenable number.

28578416 is a deficient number, since it is larger than the sum of its proper divisors (27313096).

28578416 is a wasteful number, since it uses less digits than its factorization.

28578416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16808 (or 16802 counting only the distinct ones).

The product of its digits is 107520, while the sum is 41.

The square root of 28578416 is about 5345.8784123846. The cubic root of 28578416 is about 305.7356282385.

The spelling of 28578416 in words is "twenty-eight million, five hundred seventy-eight thousand, four hundred sixteen".