79981787 has 8 divisors (see below), whose sum is σ = 88369056. Its totient is φ = 72003712.

The previous prime is 79981777. The next prime is 79981801. The reversal of 79981787 is 78718997.

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

It is a cyclic number.

It is not a de Polignac number, because 79981787 - 2⁴ = 79981771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79981777) 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, 101888 + ... + 102669.

It is an arithmetic number, because the mean of its divisors is an integer number (11046132).

Almost surely, 2^79981787 is an apocalyptic number.

79981787 is a deficient number, since it is larger than the sum of its proper divisors (8387269).

79981787 is a wasteful number, since it uses less digits than its factorization.

79981787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204597.

The product of its digits is 1778112, while the sum is 56.

The square root of 79981787 is about 8943.2537143928. The cubic root of 79981787 is about 430.8542365921.

The spelling of 79981787 in words is "seventy-nine million, nine hundred eighty-one thousand, seven hundred eighty-seven".