74697879647 has 4 divisors (see below), whose sum is σ = 74698702080. Its totient is φ = 74697057216.

The previous prime is 74697879491. The next prime is 74697879649.

74697879647 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 74697879647 - 2⁸ = 74697879391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74697879649) 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, 255263 + ... + 463200.

It is an arithmetic number, because the mean of its divisors is an integer number (18674675520).

Almost surely, 2^74697879647 is an apocalyptic number.

74697879647 is a deficient number, since it is larger than the sum of its proper divisors (822433).

74697879647 is a wasteful number, since it uses less digits than its factorization.

74697879647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822432.

The product of its digits is 896168448, while the sum is 74.

The spelling of 74697879647 in words is "seventy-four billion, six hundred ninety-seven million, eight hundred seventy-nine thousand, six hundred forty-seven".