28878657 has 8 divisors (see below), whose sum is σ = 38808576. Its totient is φ = 19100592.

The previous prime is 28878653. The next prime is 28878659. The reversal of 28878657 is 75687882.

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

It is not a de Polignac number, because 28878657 - 2² = 28878653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28878653) 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, 37518 + ... + 38279.

It is an arithmetic number, because the mean of its divisors is an integer number (4851072).

Almost surely, 2^28878657 is an apocalyptic number.

It is an amenable number.

28878657 is a deficient number, since it is larger than the sum of its proper divisors (9929919).

28878657 is a wasteful number, since it uses less digits than its factorization.

28878657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75927.

The product of its digits is 1505280, while the sum is 51.

The square root of 28878657 is about 5373.8865823536. The cubic root of 28878657 is about 306.8025730052.

The spelling of 28878657 in words is "twenty-eight million, eight hundred seventy-eight thousand, six hundred fifty-seven".