28879847 has 2 divisors, whose sum is σ = 28879848. Its totient is φ = 28879846.

The previous prime is 28879843. The next prime is 28879883. The reversal of 28879847 is 74897882.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28879847 - 2² = 28879843 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28879843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14439923 + 14439924.

It is an arithmetic number, because the mean of its divisors is an integer number (14439924).

Almost surely, 2^28879847 is an apocalyptic number.

28879847 is a deficient number, since it is larger than the sum of its proper divisors (1).

28879847 is an equidigital number, since it uses as much as digits as its factorization.

28879847 is an evil number, because the sum of its binary digits is even.

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

The square root of 28879847 is about 5373.9973018229. The cubic root of 28879847 is about 306.8067870752.

The spelling of 28879847 in words is "twenty-eight million, eight hundred seventy-nine thousand, eight hundred forty-seven".