28654993 has 4 divisors (see below), whose sum is σ = 28733440. Its totient is φ = 28576548.

The previous prime is 28654973. The next prime is 28655009. The reversal of 28654993 is 39945682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28654993 is a prime.

It is a super-2 number, since 2×28654993² = 1642217247660098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28654963) 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, 38673 + ... + 39406.

It is an arithmetic number, because the mean of its divisors is an integer number (7183360).

Almost surely, 2^28654993 is an apocalyptic number.

It is an amenable number.

28654993 is a deficient number, since it is larger than the sum of its proper divisors (78447).

28654993 is an equidigital number, since it uses as much as digits as its factorization.

28654993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78446.

The product of its digits is 466560, while the sum is 46.

The square root of 28654993 is about 5353.0358676176. The cubic root of 28654993 is about 306.0084616112.

The spelling of 28654993 in words is "twenty-eight million, six hundred fifty-four thousand, nine hundred ninety-three".