28879776 has 72 divisors (see below), whose sum is σ = 82800900. Its totient is φ = 9547776.

The previous prime is 28879759. The next prime is 28879777. The reversal of 28879776 is 67797882.

It can be written as a sum of positive squares in 2 ways, for example, as 26255376 + 2624400 = 5124^2 + 1620^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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, 42576 + ... + 43248.

Almost surely, 2^28879776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28879776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41400450).

28879776 is an abundant number, since it is smaller than the sum of its proper divisors (53921124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28879776 is a wasteful number, since it uses less digits than its factorization.

28879776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 838 (or 827 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 28879776 is about 5373.9906959354. The cubic root of 28879776 is about 306.8065356507.

The spelling of 28879776 in words is "twenty-eight million, eight hundred seventy-nine thousand, seven hundred seventy-six".