28792987 has 4 divisors (see below), whose sum is σ = 30044880. Its totient is φ = 27541096.

The previous prime is 28792957. The next prime is 28792991. The reversal of 28792987 is 78929782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28792987 - 2⁷ = 28792859 is a prime.

It is a super-2 number, since 2×28792987² = 1658072200764338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28792927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625912 + ... + 625957.

It is an arithmetic number, because the mean of its divisors is an integer number (7511220).

Almost surely, 2^28792987 is an apocalyptic number.

28792987 is a deficient number, since it is larger than the sum of its proper divisors (1251893).

28792987 is a wasteful number, since it uses less digits than its factorization.

28792987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1251892.

The product of its digits is 1016064, while the sum is 52.

The square root of 28792987 is about 5365.9097085210. The cubic root of 28792987 is about 306.4988907152.

The spelling of 28792987 in words is "twenty-eight million, seven hundred ninety-two thousand, nine hundred eighty-seven".