28878479 has 4 divisors (see below), whose sum is σ = 33003984. Its totient is φ = 24752976.

The previous prime is 28878467. The next prime is 28878497. The reversal of 28878479 is 97487882.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28878479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28878479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28874479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2062742 + ... + 2062755.

It is an arithmetic number, because the mean of its divisors is an integer number (8250996).

Almost surely, 2^28878479 is an apocalyptic number.

28878479 is a deficient number, since it is larger than the sum of its proper divisors (4125505).

28878479 is an equidigital number, since it uses as much as digits as its factorization.

28878479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4125504.

The product of its digits is 1806336, while the sum is 53.

The square root of 28878479 is about 5373.8700207579. The cubic root of 28878479 is about 306.8019426553.

The spelling of 28878479 in words is "twenty-eight million, eight hundred seventy-eight thousand, four hundred seventy-nine".