28913659 has 4 divisors (see below), whose sum is σ = 28928016. Its totient is φ = 28899304.

The previous prime is 28913657. The next prime is 28913681. The reversal of 28913659 is 95631982.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95631982 = 2 ⋅47815991.

It is a cyclic number.

It is not a de Polignac number, because 28913659 - 2¹ = 28913657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28913657) 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, 3544 + ... + 8389.

It is an arithmetic number, because the mean of its divisors is an integer number (7232004).

Almost surely, 2^28913659 is an apocalyptic number.

28913659 is a deficient number, since it is larger than the sum of its proper divisors (14357).

28913659 is a wasteful number, since it uses less digits than its factorization.

28913659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14356.

The product of its digits is 116640, while the sum is 43.

The square root of 28913659 is about 5377.1422707606. The cubic root of 28913659 is about 306.9264749813.

The spelling of 28913659 in words is "twenty-eight million, nine hundred thirteen thousand, six hundred fifty-nine".