28993917 has 8 divisors (see below), whose sum is σ = 38767680. Its totient is φ = 19274720.

The previous prime is 28993901. The next prime is 28993927. The reversal of 28993917 is 71939982.

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

It is a cyclic number.

It is not a de Polignac number, because 28993917 - 2⁴ = 28993901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28993927) 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, 12384 + ... + 14537.

It is an arithmetic number, because the mean of its divisors is an integer number (4845960).

Almost surely, 2^28993917 is an apocalyptic number.

It is an amenable number.

28993917 is a deficient number, since it is larger than the sum of its proper divisors (9773763).

28993917 is a wasteful number, since it uses less digits than its factorization.

28993917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27283.

The product of its digits is 244944, while the sum is 48.

The square root of 28993917 is about 5384.5999851428. The cubic root of 28993917 is about 307.2101995684.

The spelling of 28993917 in words is "twenty-eight million, nine hundred ninety-three thousand, nine hundred seventeen".