28170490 has 16 divisors (see below), whose sum is σ = 50921640. Its totient is φ = 11220480.

The previous prime is 28170463. The next prime is 28170491. The reversal of 28170490 is 9407182.

It can be written as a sum of positive squares in 4 ways, for example, as 28164249 + 6241 = 5307^2 + 79^2 .

It is not an unprimeable number, because it can be changed into a prime (28170491) 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, 3435 + ... + 8254.

Almost surely, 2^28170490 is an apocalyptic number.

28170490 is a deficient number, since it is larger than the sum of its proper divisors (22751150).

28170490 is a wasteful number, since it uses less digits than its factorization.

28170490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11937.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28170490 is about 5307.5879644147. The cubic root of 28170490 is about 304.2739696060.

The spelling of 28170490 in words is "twenty-eight million, one hundred seventy thousand, four hundred ninety".