28178396 has 12 divisors (see below), whose sum is σ = 49482552. Its totient is φ = 14040528.

The previous prime is 28178389. The next prime is 28178419. The reversal of 28178396 is 69387182.

It is a super-2 number, since 2×28178396² = 1588044002265632, which contains 22 as substring.

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, 10850 + ... + 13193.

It is an arithmetic number, because the mean of its divisors is an integer number (4123546).

Almost surely, 2^28178396 is an apocalyptic number.

It is an amenable number.

28178396 is a deficient number, since it is larger than the sum of its proper divisors (21304156).

28178396 is a wasteful number, since it uses less digits than its factorization.

28178396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24340 (or 24338 counting only the distinct ones).

The product of its digits is 145152, while the sum is 44.

The square root of 28178396 is about 5308.3326949241. The cubic root of 28178396 is about 304.3024316005.

The spelling of 28178396 in words is "twenty-eight million, one hundred seventy-eight thousand, three hundred ninety-six".