28356172 has 18 divisors (see below), whose sum is σ = 53735388. Its totient is φ = 13087152.

The previous prime is 28356161. The next prime is 28356173. The reversal of 28356172 is 27165382.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28356173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20298 + ... + 21649.

Almost surely, 2^28356172 is an apocalyptic number.

It is an amenable number.

28356172 is a deficient number, since it is larger than the sum of its proper divisors (25379216).

28356172 is a wasteful number, since it uses less digits than its factorization.

28356172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41977 (or 41962 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 28356172 is about 5325.0513612546. The cubic root of 28356172 is about 304.9410331225.

The spelling of 28356172 in words is "twenty-eight million, three hundred fifty-six thousand, one hundred seventy-two".