28688937 has 8 divisors (see below), whose sum is σ = 38277504. Its totient is φ = 19113168.

The previous prime is 28688923. The next prime is 28688987. The reversal of 28688937 is 73988682.

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

It is not a de Polignac number, because 28688937 - 2⁴ = 28688921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28688937.

It is not an unprimeable number, because it can be changed into a prime (28688987) 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, 5143 + ... + 9155.

It is an arithmetic number, because the mean of its divisors is an integer number (4784688).

Almost surely, 2^28688937 is an apocalyptic number.

It is an amenable number.

28688937 is a deficient number, since it is larger than the sum of its proper divisors (9588567).

28688937 is a wasteful number, since it uses less digits than its factorization.

28688937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6399.

The product of its digits is 1161216, while the sum is 51.

The square root of 28688937 is about 5356.2054665593. The cubic root of 28688937 is about 306.1292439645.

The spelling of 28688937 in words is "twenty-eight million, six hundred eighty-eight thousand, nine hundred thirty-seven".