670790261 has 4 divisors (see below), whose sum is σ = 676726572. Its totient is φ = 664853952.

The previous prime is 670790257. The next prime is 670790273. The reversal of 670790261 is 162097076.

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

It can be written as a sum of positive squares in 2 ways, for example, as 266016100 + 404774161 = 16310^2 + 20119^2 .

It is a cyclic number.

It is not a de Polignac number, because 670790261 - 2² = 670790257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670792261) 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, 2967986 + ... + 2968211.

It is an arithmetic number, because the mean of its divisors is an integer number (169181643).

Almost surely, 2^670790261 is an apocalyptic number.

It is an amenable number.

670790261 is a deficient number, since it is larger than the sum of its proper divisors (5936311).

670790261 is a wasteful number, since it uses less digits than its factorization.

670790261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5936310.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 670790261 is about 25899.6189354207. The cubic root of 670790261 is about 875.3779095749.

The spelling of 670790261 in words is "six hundred seventy million, seven hundred ninety thousand, two hundred sixty-one".