28165490 has 8 divisors (see below), whose sum is σ = 50697900. Its totient is φ = 11266192.

The previous prime is 28165477. The next prime is 28165493. The reversal of 28165490 is 9456182.

It can be written as a sum of positive squares in 2 ways, for example, as 28121809 + 43681 = 5303^2 + 209^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 28165490.

It is not an unprimeable number, because it can be changed into a prime (28165493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1408265 + ... + 1408284.

Almost surely, 2^28165490 is an apocalyptic number.

28165490 is a deficient number, since it is larger than the sum of its proper divisors (22532410).

28165490 is a wasteful number, since it uses less digits than its factorization.

28165490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816556.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 28165490 is about 5307.1169197597. The cubic root of 28165490 is about 304.2559666075.

The spelling of 28165490 in words is "twenty-eight million, one hundred sixty-five thousand, four hundred ninety".