28113945 has 8 divisors (see below), whose sum is σ = 44982336. Its totient is φ = 14994096.

The previous prime is 28113923. The next prime is 28113961. The reversal of 28113945 is 54931182.

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

It is not a de Polignac number, because 28113945 - 2⁸ = 28113689 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 937117 + ... + 937146.

It is an arithmetic number, because the mean of its divisors is an integer number (5622792).

Almost surely, 2^28113945 is an apocalyptic number.

It is an amenable number.

28113945 is a deficient number, since it is larger than the sum of its proper divisors (16868391).

28113945 is a wasteful number, since it uses less digits than its factorization.

28113945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874271.

The product of its digits is 8640, while the sum is 33.

The square root of 28113945 is about 5302.2584810626. The cubic root of 28113945 is about 304.0702493759.

The spelling of 28113945 in words is "twenty-eight million, one hundred thirteen thousand, nine hundred forty-five".