79287989 has 8 divisors (see below), whose sum is σ = 86580768. Its totient is φ = 72009360.

The previous prime is 79287979. The next prime is 79288009. The reversal of 79287989 is 98978297.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79287989 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 (79287959) 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, 10694 + ... + 16520.

It is an arithmetic number, because the mean of its divisors is an integer number (10822596).

Almost surely, 2^79287989 is an apocalyptic number.

It is an amenable number.

79287989 is a deficient number, since it is larger than the sum of its proper divisors (7292779).

79287989 is a wasteful number, since it uses less digits than its factorization.

79287989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7075.

The product of its digits is 4572288, while the sum is 59.

The square root of 79287989 is about 8904.3803265584. The cubic root of 79287989 is about 429.6048090767.

The spelling of 79287989 in words is "seventy-nine million, two hundred eighty-seven thousand, nine hundred eighty-nine".