28615971 has 8 divisors (see below), whose sum is σ = 38234304. Its totient is φ = 19037480.

The previous prime is 28615967. The next prime is 28615999. The reversal of 28615971 is 17951682.

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 28615971 - 2² = 28615967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28615931) 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, 8241 + ... + 11186.

It is an arithmetic number, because the mean of its divisors is an integer number (4779288).

Almost surely, 2^28615971 is an apocalyptic number.

28615971 is a deficient number, since it is larger than the sum of its proper divisors (9618333).

28615971 is a wasteful number, since it uses less digits than its factorization.

28615971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19921.

The product of its digits is 30240, while the sum is 39.

The square root of 28615971 is about 5349.3897782831. The cubic root of 28615971 is about 305.8694923841.

The spelling of 28615971 in words is "twenty-eight million, six hundred fifteen thousand, nine hundred seventy-one".