28779315 has 32 divisors (see below), whose sum is σ = 48384000. Its totient is φ = 14588160.

The previous prime is 28779313. The next prime is 28779323. The reversal of 28779315 is 51397782.

It is not a de Polignac number, because 28779315 - 2¹ = 28779313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28779313) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26911 + ... + 27959.

It is an arithmetic number, because the mean of its divisors is an integer number (1512000).

Almost surely, 2^28779315 is an apocalyptic number.

28779315 is a deficient number, since it is larger than the sum of its proper divisors (19604685).

28779315 is a wasteful number, since it uses less digits than its factorization.

28779315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147.

The product of its digits is 105840, while the sum is 42.

The square root of 28779315 is about 5364.6355887423. The cubic root of 28779315 is about 306.4503706100.

The spelling of 28779315 in words is "twenty-eight million, seven hundred seventy-nine thousand, three hundred fifteen".