670942491 has 8 divisors (see below), whose sum is σ = 916409424. Its totient is φ = 436385280.

The previous prime is 670942487. The next prime is 670942507. The reversal of 670942491 is 194249076.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 670942491 - 2² = 670942487 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (670942411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2727286 + ... + 2727531.

It is an arithmetic number, because the mean of its divisors is an integer number (114551178).

Almost surely, 2^670942491 is an apocalyptic number.

670942491 is a deficient number, since it is larger than the sum of its proper divisors (245466933).

670942491 is a wasteful number, since it uses less digits than its factorization.

670942491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5454861.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 670942491 is about 25902.5576150310. The cubic root of 670942491 is about 875.4441243605. Note that the first 3 decimals are identical.

The spelling of 670942491 in words is "six hundred seventy million, nine hundred forty-two thousand, four hundred ninety-one".