79757987 has 4 divisors (see below), whose sum is σ = 79811880. Its totient is φ = 79704096.

The previous prime is 79757969. The next prime is 79757989. The reversal of 79757987 is 78975797.

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 79757987 - 2¹⁴ = 79741603 is a prime.

It is a super-2 number, since 2×79757987² = 12722672980584338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79757989) 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, 24662 + ... + 27707.

It is an arithmetic number, because the mean of its divisors is an integer number (19952970).

Almost surely, 2^79757987 is an apocalyptic number.

79757987 is a deficient number, since it is larger than the sum of its proper divisors (53893).

79757987 is a wasteful number, since it uses less digits than its factorization.

79757987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53892.

The product of its digits is 7779240, while the sum is 59.

The square root of 79757987 is about 8930.7327246985. The cubic root of 79757987 is about 430.4519981209.

The spelling of 79757987 in words is "seventy-nine million, seven hundred fifty-seven thousand, nine hundred eighty-seven".