28739913 has 8 divisors (see below), whose sum is σ = 40336800. Its totient is φ = 18151488.

The previous prime is 28739891. The next prime is 28739917. The reversal of 28739913 is 31993782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28739913 - 2⁶ = 28739849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28739917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252048 + ... + 252161.

It is an arithmetic number, because the mean of its divisors is an integer number (5042100).

Almost surely, 2^28739913 is an apocalyptic number.

It is an amenable number.

28739913 is a deficient number, since it is larger than the sum of its proper divisors (11596887).

28739913 is a wasteful number, since it uses less digits than its factorization.

28739913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504231.

The product of its digits is 81648, while the sum is 42.

The square root of 28739913 is about 5360.9619472628. The cubic root of 28739913 is about 306.3104521507.

The spelling of 28739913 in words is "twenty-eight million, seven hundred thirty-nine thousand, nine hundred thirteen".