28617987 has 16 divisors (see below), whose sum is σ = 40919040. Its totient is φ = 17726592.

The previous prime is 28617977. The next prime is 28617997. The reversal of 28617987 is 78971682.

It is an interprime number because it is at equal distance from previous prime (28617977) and next prime (28617997).

It is not a de Polignac number, because 28617987 - 2⁶ = 28617923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28617907) 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, 478 + ... + 7580.

It is an arithmetic number, because the mean of its divisors is an integer number (2557440).

Almost surely, 2^28617987 is an apocalyptic number.

28617987 is a deficient number, since it is larger than the sum of its proper divisors (12301053).

28617987 is a wasteful number, since it uses less digits than its factorization.

28617987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7202.

The product of its digits is 338688, while the sum is 48.

The square root of 28617987 is about 5349.5782076721. The cubic root of 28617987 is about 305.8766750679.

The spelling of 28617987 in words is "twenty-eight million, six hundred seventeen thousand, nine hundred eighty-seven".