28987679 has 8 divisors (see below), whose sum is σ = 33248928. Its totient is φ = 24756480.

The previous prime is 28987649. The next prime is 28987681. The reversal of 28987679 is 97678982.

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

It is not a de Polignac number, because 28987679 - 2⁸ = 28987423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28987639) 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, 5402 + ... + 9335.

It is an arithmetic number, because the mean of its divisors is an integer number (4156116).

Almost surely, 2^28987679 is an apocalyptic number.

28987679 is a deficient number, since it is larger than the sum of its proper divisors (4261249).

28987679 is a wasteful number, since it uses less digits than its factorization.

28987679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15025.

The product of its digits is 3048192, while the sum is 56.

The square root of 28987679 is about 5384.0207094698. The cubic root of 28987679 is about 307.1881660424.

The spelling of 28987679 in words is "twenty-eight million, nine hundred eighty-seven thousand, six hundred seventy-nine".