28215884 has 6 divisors (see below), whose sum is σ = 49377804. Its totient is φ = 14107940.

The previous prime is 28215851. The next prime is 28215899. The reversal of 28215884 is 48851282.

It is a super-2 number, since 2×28215884² = 1592272219802912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3526982 + ... + 3526989.

It is an arithmetic number, because the mean of its divisors is an integer number (8229634).

Almost surely, 2^28215884 is an apocalyptic number.

It is an amenable number.

28215884 is a deficient number, since it is larger than the sum of its proper divisors (21161920).

28215884 is a wasteful number, since it uses less digits than its factorization.

28215884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7053975 (or 7053973 counting only the distinct ones).

The product of its digits is 40960, while the sum is 38.

The square root of 28215884 is about 5311.8625735235. The cubic root of 28215884 is about 304.4373178497.

The spelling of 28215884 in words is "twenty-eight million, two hundred fifteen thousand, eight hundred eighty-four".