28772279 has 8 divisors (see below), whose sum is σ = 30920688. Its totient is φ = 26674560.

The previous prime is 28772257. The next prime is 28772299. The reversal of 28772279 is 97227782.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28772279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28772299) 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, 11492 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (3865086).

Almost surely, 2^28772279 is an apocalyptic number.

28772279 is a deficient number, since it is larger than the sum of its proper divisors (2148409).

28772279 is a wasteful number, since it uses less digits than its factorization.

28772279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25345.

The product of its digits is 197568, while the sum is 44.

The square root of 28772279 is about 5363.9797725197. The cubic root of 28772279 is about 306.4253947950.

The spelling of 28772279 in words is "twenty-eight million, seven hundred seventy-two thousand, two hundred seventy-nine".