28879775 has 12 divisors (see below), whose sum is σ = 35947104. Its totient is φ = 23016000.

The previous prime is 28879759. The next prime is 28879777. The reversal of 28879775 is 57797882.

It is not a de Polignac number, because 28879775 - 2⁴ = 28879759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28879777) 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, 4970 + ... + 9080.

It is an arithmetic number, because the mean of its divisors is an integer number (2995592).

Almost surely, 2^28879775 is an apocalyptic number.

28879775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28879775 is a deficient number, since it is larger than the sum of its proper divisors (7067329).

28879775 is a wasteful number, since it uses less digits than its factorization.

28879775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4402 (or 4397 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 53.

The square root of 28879775 is about 5373.9906028946. The cubic root of 28879775 is about 306.8065321095.

The spelling of 28879775 in words is "twenty-eight million, eight hundred seventy-nine thousand, seven hundred seventy-five".