77640347 has 6 divisors (see below), whose sum is σ = 79581924. Its totient is φ = 75745040.

The previous prime is 77640317. The next prime is 77640361. The reversal of 77640347 is 74304677.

It is a de Polignac number, because none of the positive numbers 2^k-77640347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77640347.

It is not an unprimeable number, because it can be changed into a prime (77640317) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21413 + ... + 24774.

It is an arithmetic number, because the mean of its divisors is an integer number (13263654).

Almost surely, 2^77640347 is an apocalyptic number.

77640347 is a deficient number, since it is larger than the sum of its proper divisors (1941577).

77640347 is an equidigital number, since it uses as much as digits as its factorization.

77640347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46269 (or 46228 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 38.

The square root of 77640347 is about 8811.3759992410. The cubic root of 77640347 is about 426.6081577349.

The spelling of 77640347 in words is "seventy-seven million, six hundred forty thousand, three hundred forty-seven".