28714639 has 2 divisors, whose sum is σ = 28714640. Its totient is φ = 28714638.

The previous prime is 28714589. The next prime is 28714667. The reversal of 28714639 is 93641782.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28714639 - 2¹⁵ = 28681871 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 (28718639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14357319 + 14357320.

It is an arithmetic number, because the mean of its divisors is an integer number (14357320).

Almost surely, 2^28714639 is an apocalyptic number.

28714639 is a deficient number, since it is larger than the sum of its proper divisors (1).

28714639 is an equidigital number, since it uses as much as digits as its factorization.

28714639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 28714639 is about 5358.6042025886. The cubic root of 28714639 is about 306.2206355852.

The spelling of 28714639 in words is "twenty-eight million, seven hundred fourteen thousand, six hundred thirty-nine".