28756491 has 8 divisors (see below), whose sum is σ = 38882304. Its totient is φ = 18900840.

The previous prime is 28756477. The next prime is 28756517. The reversal of 28756491 is 19465782.

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

It is not a de Polignac number, because 28756491 - 2²³ = 20367883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28756451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67291 + ... + 67716.

It is an arithmetic number, because the mean of its divisors is an integer number (4860288).

Almost surely, 2^28756491 is an apocalyptic number.

28756491 is a deficient number, since it is larger than the sum of its proper divisors (10125813).

28756491 is a wasteful number, since it uses less digits than its factorization.

28756491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135081.

The product of its digits is 120960, while the sum is 42.

The square root of 28756491 is about 5362.5079020921. The cubic root of 28756491 is about 306.3693370263.

The spelling of 28756491 in words is "twenty-eight million, seven hundred fifty-six thousand, four hundred ninety-one".