670726779 has 4 divisors (see below), whose sum is σ = 894302376. Its totient is φ = 447151184.

The previous prime is 670726747. The next prime is 670726811. The reversal of 670726779 is 977627076.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (670726747) and next prime (670726811).

It is a cyclic number.

It is not a de Polignac number, because 670726779 - 2⁵ = 670726747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (670726379) 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, 111787794 + ... + 111787799.

It is an arithmetic number, because the mean of its divisors is an integer number (223575594).

Almost surely, 2^670726779 is an apocalyptic number.

670726779 is a deficient number, since it is larger than the sum of its proper divisors (223575597).

670726779 is a wasteful number, since it uses less digits than its factorization.

670726779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223575596.

The product of its (nonzero) digits is 1555848, while the sum is 51.

The square root of 670726779 is about 25898.3933671570. The cubic root of 670726779 is about 875.3502941404.

The spelling of 670726779 in words is "six hundred seventy million, seven hundred twenty-six thousand, seven hundred seventy-nine".