28704091 has 8 divisors (see below), whose sum is σ = 31631600. Its totient is φ = 25879392.

The previous prime is 28704089. The next prime is 28704101. The reversal of 28704091 is 19040782.

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 28704091 - 2¹ = 28704089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28704061) 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, 25116 + ... + 26233.

It is an arithmetic number, because the mean of its divisors is an integer number (3953950).

Almost surely, 2^28704091 is an apocalyptic number.

28704091 is a deficient number, since it is larger than the sum of its proper divisors (2927509).

28704091 is a wasteful number, since it uses less digits than its factorization.

28704091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51405.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 28704091 is about 5357.6199006648. The cubic root of 28704091 is about 306.1831354231.

The spelling of 28704091 in words is "twenty-eight million, seven hundred four thousand, ninety-one".