28918779 has 8 divisors (see below), whose sum is σ = 40587840. Its totient is φ = 18264456.

The previous prime is 28918759. The next prime is 28918787. The reversal of 28918779 is 97781982.

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

It is not a de Polignac number, because 28918779 - 2⁷ = 28918651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28918739) 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, 253617 + ... + 253730.

It is an arithmetic number, because the mean of its divisors is an integer number (5073480).

Almost surely, 2^28918779 is an apocalyptic number.

28918779 is a deficient number, since it is larger than the sum of its proper divisors (11669061).

28918779 is a wasteful number, since it uses less digits than its factorization.

28918779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507369.

The product of its digits is 508032, while the sum is 51.

The square root of 28918779 is about 5377.6183390047. The cubic root of 28918779 is about 306.9445906500.

The spelling of 28918779 in words is "twenty-eight million, nine hundred eighteen thousand, seven hundred seventy-nine".