617617879 has 4 divisors (see below), whose sum is σ = 620078760. Its totient is φ = 615157000.

The previous prime is 617617849. The next prime is 617617883. The reversal of 617617879 is 978716716.

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 617617879 - 2⁷ = 617617751 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 (617617829) 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, 1230064 + ... + 1230565.

It is an arithmetic number, because the mean of its divisors is an integer number (155019690).

Almost surely, 2^617617879 is an apocalyptic number.

617617879 is a deficient number, since it is larger than the sum of its proper divisors (2460881).

617617879 is a wasteful number, since it uses less digits than its factorization.

617617879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2460880.

The product of its digits is 889056, while the sum is 52.

The square root of 617617879 is about 24851.9190204700. The cubic root of 617617879 is about 851.6084326860.

The spelling of 617617879 in words is "six hundred seventeen million, six hundred seventeen thousand, eight hundred seventy-nine".