28398657 has 8 divisors (see below), whose sum is σ = 43274176. Its totient is φ = 16227792.

The previous prime is 28398649. The next prime is 28398661. The reversal of 28398657 is 75689382.

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

It is not a de Polignac number, because 28398657 - 2³ = 28398649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28398677) 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, 676138 + ... + 676179.

It is an arithmetic number, because the mean of its divisors is an integer number (5409272).

Almost surely, 2^28398657 is an apocalyptic number.

It is an amenable number.

28398657 is a deficient number, since it is larger than the sum of its proper divisors (14875519).

28398657 is a wasteful number, since it uses less digits than its factorization.

28398657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1352327.

The product of its digits is 725760, while the sum is 48.

The square root of 28398657 is about 5329.0390315703. The cubic root of 28398657 is about 305.0932510707.

The spelling of 28398657 in words is "twenty-eight million, three hundred ninety-eight thousand, six hundred fifty-seven".