28578216 has 32 divisors (see below), whose sum is σ = 71868960. Its totient is φ = 9469632.

The previous prime is 28578211. The next prime is 28578217. The reversal of 28578216 is 61287582.

It is not an unprimeable number, because it can be changed into a prime (28578211) 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, 711 + ... + 7593.

It is an arithmetic number, because the mean of its divisors is an integer number (2245905).

Almost surely, 2^28578216 is an apocalyptic number.

It is an amenable number.

28578216 is an abundant number, since it is smaller than the sum of its proper divisors (43290744).

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

28578216 is a wasteful number, since it uses less digits than its factorization.

28578216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065 (or 7061 counting only the distinct ones).

The product of its digits is 53760, while the sum is 39.

The square root of 28578216 is about 5345.8597063522. The cubic root of 28578216 is about 305.7349150282.

The spelling of 28578216 in words is "twenty-eight million, five hundred seventy-eight thousand, two hundred sixteen".