28979945 has 8 divisors (see below), whose sum is σ = 34922880. Its totient is φ = 23086000.

The previous prime is 28979897. The next prime is 28979957. The reversal of 28979945 is 54997982.

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

It is not a de Polignac number, because 28979945 - 2²² = 24785641 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, 10931 + ... + 13320.

It is an arithmetic number, because the mean of its divisors is an integer number (4365360).

Almost surely, 2^28979945 is an apocalyptic number.

It is an amenable number.

28979945 is a deficient number, since it is larger than the sum of its proper divisors (5942935).

28979945 is a wasteful number, since it uses less digits than its factorization.

28979945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24495.

The product of its digits is 1632960, while the sum is 53.

The square root of 28979945 is about 5383.3024250919. The cubic root of 28979945 is about 307.1608440366.

The spelling of 28979945 in words is "twenty-eight million, nine hundred seventy-nine thousand, nine hundred forty-five".