28880979 has 8 divisors (see below), whose sum is σ = 39548880. Its totient is φ = 18733536.

The previous prime is 28880963. The next prime is 28880989. The reversal of 28880979 is 97908882.

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

It is not a de Polignac number, because 28880979 - 2⁴ = 28880963 is a prime.

It is a super-2 number, since 2×28880979² = 1668221895996882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28880959) 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, 129984 + ... + 130205.

It is an arithmetic number, because the mean of its divisors is an integer number (4943610).

Almost surely, 2^28880979 is an apocalyptic number.

28880979 is a deficient number, since it is larger than the sum of its proper divisors (10667901).

28880979 is a wasteful number, since it uses less digits than its factorization.

28880979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260229.

The product of its (nonzero) digits is 580608, while the sum is 51.

The square root of 28880979 is about 5374.1026227641. The cubic root of 28880979 is about 306.8107956461.

The spelling of 28880979 in words is "twenty-eight million, eight hundred eighty thousand, nine hundred seventy-nine".