28497251 has 8 divisors (see below), whose sum is σ = 28910064. Its totient is φ = 28087200.

The previous prime is 28497247. The next prime is 28497257. The reversal of 28497251 is 15279482.

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

It is a cyclic number.

It is not a de Polignac number, because 28497251 - 2² = 28497247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28497257) 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, 28085 + ... + 29081.

It is an arithmetic number, because the mean of its divisors is an integer number (3613758).

Almost surely, 2^28497251 is an apocalyptic number.

28497251 is a deficient number, since it is larger than the sum of its proper divisors (412813).

28497251 is a wasteful number, since it uses less digits than its factorization.

28497251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381.

The product of its digits is 40320, while the sum is 38.

The square root of 28497251 is about 5338.2816523672. The cubic root of 28497251 is about 305.4459158715.

The spelling of 28497251 in words is "twenty-eight million, four hundred ninety-seven thousand, two hundred fifty-one".