28791897 has 32 divisors (see below), whose sum is σ = 43845120. Its totient is φ = 16692480.

The previous prime is 28791869. The next prime is 28791907. The reversal of 28791897 is 79819782.

It is not a de Polignac number, because 28791897 - 2¹⁶ = 28726361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (28791827) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41322 + ... + 42012.

It is an arithmetic number, because the mean of its divisors is an integer number (1370160).

Almost surely, 2^28791897 is an apocalyptic number.

It is an amenable number.

28791897 is a deficient number, since it is larger than the sum of its proper divisors (15053223).

28791897 is a wasteful number, since it uses less digits than its factorization.

28791897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773.

The product of its digits is 508032, while the sum is 51.

The square root of 28791897 is about 5365.8081404389. The cubic root of 28791897 is about 306.4950230140.

The spelling of 28791897 in words is "twenty-eight million, seven hundred ninety-one thousand, eight hundred ninety-seven".