79640387 has 4 divisors (see below), whose sum is σ = 79739640. Its totient is φ = 79541136.

The previous prime is 79640369. The next prime is 79640411. The reversal of 79640387 is 78304697.

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 79640387 - 2⁸ = 79640131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79640357) 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, 48413 + ... + 50030.

It is an arithmetic number, because the mean of its divisors is an integer number (19934910).

Almost surely, 2^79640387 is an apocalyptic number.

79640387 is a deficient number, since it is larger than the sum of its proper divisors (99253).

79640387 is an equidigital number, since it uses as much as digits as its factorization.

79640387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99252.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 79640387 is about 8924.1462897019. The cubic root of 79640387 is about 430.2403325690.

The spelling of 79640387 in words is "seventy-nine million, six hundred forty thousand, three hundred eighty-seven".