670900891 has 4 divisors (see below), whose sum is σ = 671099752. Its totient is φ = 670702032.

The previous prime is 670900837. The next prime is 670900931. The reversal of 670900891 is 198009076.

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 670900891 - 2¹⁵ = 670868123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (670900831) 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, 94281 + ... + 101146.

It is an arithmetic number, because the mean of its divisors is an integer number (167774938).

Almost surely, 2^670900891 is an apocalyptic number.

670900891 is a deficient number, since it is larger than the sum of its proper divisors (198861).

670900891 is a wasteful number, since it uses less digits than its factorization.

670900891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198860.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 670900891 is about 25901.7545930773. The cubic root of 670900891 is about 875.4260307937.

The spelling of 670900891 in words is "six hundred seventy million, nine hundred thousand, eight hundred ninety-one".