79042987 has 4 divisors (see below), whose sum is σ = 80881240. Its totient is φ = 77204736.

The previous prime is 79042967. The next prime is 79042993. The reversal of 79042987 is 78924097.

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 79042987 - 2²³ = 70654379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79042967) 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, 919062 + ... + 919147.

It is an arithmetic number, because the mean of its divisors is an integer number (20220310).

Almost surely, 2^79042987 is an apocalyptic number.

79042987 is a deficient number, since it is larger than the sum of its proper divisors (1838253).

79042987 is a wasteful number, since it uses less digits than its factorization.

79042987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838252.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 79042987 is about 8890.6122961245. The cubic root of 79042987 is about 429.1618557457.

The spelling of 79042987 in words is "seventy-nine million, forty-two thousand, nine hundred eighty-seven".