28532397 has 16 divisors (see below), whose sum is σ = 39876480. Its totient is φ = 18112512.

The previous prime is 28532389. The next prime is 28532401. The reversal of 28532397 is 79323582.

It is not a de Polignac number, because 28532397 - 2³ = 28532389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28532347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16929 + ... + 18537.

It is an arithmetic number, because the mean of its divisors is an integer number (2492280).

Almost surely, 2^28532397 is an apocalyptic number.

It is an amenable number.

28532397 is a deficient number, since it is larger than the sum of its proper divisors (11344083).

28532397 is a wasteful number, since it uses less digits than its factorization.

28532397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1892.

The product of its digits is 90720, while the sum is 39.

The square root of 28532397 is about 5341.5725212712. The cubic root of 28532397 is about 305.5714343165.

The spelling of 28532397 in words is "twenty-eight million, five hundred thirty-two thousand, three hundred ninety-seven".