28879551 has 16 divisors (see below), whose sum is σ = 42887520. Its totient is φ = 19206720.

The previous prime is 28879517. The next prime is 28879561. The reversal of 28879551 is 15597882.

It is a happy number.

28879551 is a `hidden beast` number, since 28 + 8 + 79 + 551 = 666.

It is not a de Polignac number, because 28879551 - 2⁷ = 28879423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28879497 and 28879506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28879511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13041 + ... + 15093.

It is an arithmetic number, because the mean of its divisors is an integer number (2680470).

Almost surely, 2^28879551 is an apocalyptic number.

28879551 is a deficient number, since it is larger than the sum of its proper divisors (14007969).

28879551 is a wasteful number, since it uses less digits than its factorization.

28879551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583 (or 2577 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 28879551 is about 5373.9697617311. The cubic root of 28879551 is about 306.8057388803.

The spelling of 28879551 in words is "twenty-eight million, eight hundred seventy-nine thousand, five hundred fifty-one".