28938170 has 16 divisors (see below), whose sum is σ = 52551720. Its totient is φ = 11472384.

The previous prime is 28938167. The next prime is 28938179. The reversal of 28938170 is 7183982.

It can be written as a sum of positive squares in 4 ways, for example, as 24216241 + 4721929 = 4921^2 + 2173^2 .

It is not an unprimeable number, because it can be changed into a prime (28938179) 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, 11675 + ... + 13934.

Almost surely, 2^28938170 is an apocalyptic number.

28938170 is a deficient number, since it is larger than the sum of its proper divisors (23613550).

28938170 is a wasteful number, since it uses less digits than its factorization.

28938170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25729.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28938170 is about 5379.4209725583. The cubic root of 28938170 is about 307.0131808295.

The spelling of 28938170 in words is "twenty-eight million, nine hundred thirty-eight thousand, one hundred seventy".