671664294 has 24 divisors (see below), whose sum is σ = 1663169040. Its totient is φ = 191904048.

The previous prime is 671664289. The next prime is 671664341. The reversal of 671664294 is 492466176.

671664294 is a `hidden beast` number, since 67 + 166 + 429 + 4 = 666.

It is a super-2 number, since 2×671664294² = 902265847669036872, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2665209 + ... + 2665460.

It is an arithmetic number, because the mean of its divisors is an integer number (69298710).

Almost surely, 2^671664294 is an apocalyptic number.

671664294 is an abundant number, since it is smaller than the sum of its proper divisors (991504746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671664294 is a wasteful number, since it uses less digits than its factorization.

671664294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5330684 (or 5330681 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 671664294 is about 25916.4869147035. The cubic root of 671664294 is about 875.7579474474.

The spelling of 671664294 in words is "six hundred seventy-one million, six hundred sixty-four thousand, two hundred ninety-four".