670684745 has 4 divisors (see below), whose sum is σ = 804821700. Its totient is φ = 536547792.

The previous prime is 670684709. The next prime is 670684759. The reversal of 670684745 is 547486076.

It is a happy number.

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 494751049 + 175933696 = 22243^2 + 13264^2 .

It is a cyclic number.

It is not a de Polignac number, because 670684745 - 2⁸ = 670684489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 670684745.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67068470 + ... + 67068479.

It is an arithmetic number, because the mean of its divisors is an integer number (201205425).

Almost surely, 2^670684745 is an apocalyptic number.

It is an amenable number.

670684745 is a deficient number, since it is larger than the sum of its proper divisors (134136955).

670684745 is a wasteful number, since it uses less digits than its factorization.

670684745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134136954.

The product of its (nonzero) digits is 1128960, while the sum is 47.

The square root of 670684745 is about 25897.5818369206. The cubic root of 670684745 is about 875.3320078853.

The spelling of 670684745 in words is "six hundred seventy million, six hundred eighty-four thousand, seven hundred forty-five".