670491 has 16 divisors (see below), whose sum is σ = 1046400. Its totient is φ = 423144.

The previous prime is 670489. The next prime is 670493. The reversal of 670491 is 194076.

It is an interprime number because it is at equal distance from previous prime (670489) and next prime (670493).

It is not a de Polignac number, because 670491 - 2¹ = 670489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (670493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (65400).

2⁶⁷⁰⁴⁹¹ is an apocalyptic number.

670491 is a deficient number, since it is larger than the sum of its proper divisors (375909).

670491 is a wasteful number, since it uses less digits than its factorization.

670491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 670491 is about 818.8351482441. The cubic root of 670491 is about 87.5247712179.

The spelling of 670491 in words is "six hundred seventy thousand, four hundred ninety-one".