28779291 has 12 divisors (see below), whose sum is σ = 41625168. Its totient is φ = 19160784.

The previous prime is 28779271. The next prime is 28779293. The reversal of 28779291 is 19297782.

It is not a de Polignac number, because 28779291 - 2⁶ = 28779227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28779293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7221 + ... + 10473.

It is an arithmetic number, because the mean of its divisors is an integer number (3468764).

Almost surely, 2^28779291 is an apocalyptic number.

28779291 is a deficient number, since it is larger than the sum of its proper divisors (12845877).

28779291 is a wasteful number, since it uses less digits than its factorization.

28779291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242 (or 4239 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 28779291 is about 5364.6333518704. The cubic root of 28779291 is about 306.4502854237.

The spelling of 28779291 in words is "twenty-eight million, seven hundred seventy-nine thousand, two hundred ninety-one".