28179987 has 16 divisors (see below), whose sum is σ = 41664000. Its totient is φ = 16797600.

The previous prime is 28179979. The next prime is 28179989. The reversal of 28179987 is 78997182.

It is not a de Polignac number, because 28179987 - 2³ = 28179979 is a prime.

It is a super-2 number, since 2×28179987² = 1588223334640338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28179989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4987 + ... + 9012.

It is an arithmetic number, because the mean of its divisors is an integer number (2604000).

Almost surely, 2^28179987 is an apocalyptic number.

28179987 is a deficient number, since it is larger than the sum of its proper divisors (13484013).

28179987 is a wasteful number, since it uses less digits than its factorization.

28179987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14074.

The product of its digits is 508032, while the sum is 51.

The square root of 28179987 is about 5308.4825515396. The cubic root of 28179987 is about 304.3081586364.

The spelling of 28179987 in words is "twenty-eight million, one hundred seventy-nine thousand, nine hundred eighty-seven".