28690172 has 24 divisors (see below), whose sum is σ = 58466016. Its totient is φ = 12063168.

The previous prime is 28690153. The next prime is 28690199. The reversal of 28690172 is 27109682.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8183 + ... + 11150.

It is an arithmetic number, because the mean of its divisors is an integer number (2436084).

Almost surely, 2^28690172 is an apocalyptic number.

It is an amenable number.

28690172 is an abundant number, since it is smaller than the sum of its proper divisors (29775844).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28690172 is a wasteful number, since it uses less digits than its factorization.

28690172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19397 (or 19395 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 28690172 is about 5356.3207521581. The cubic root of 28690172 is about 306.1336366472.

It can be divided in two parts, 28 and 690172, that multiplied together give a square (19324816 = 4396²).

The spelling of 28690172 in words is "twenty-eight million, six hundred ninety thousand, one hundred seventy-two".