671670636 has 72 divisors (see below), whose sum is σ = 1963367280. Its totient is φ = 177141888.

The previous prime is 671670631. The next prime is 671670661. The reversal of 671670636 is 636076176.

It is a super-2 number, since 2×671670636² = 902282886529288992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (671670631) 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 23 ways as a sum of consecutive naturals, for example, 36291 + ... + 51578.

It is an arithmetic number, because the mean of its divisors is an integer number (27268990).

Almost surely, 2^671670636 is an apocalyptic number.

It is an amenable number.

671670636 is an abundant number, since it is smaller than the sum of its proper divisors (1291696644).

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

671670636 is a wasteful number, since it uses less digits than its factorization.

671670636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87903 (or 87894 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 671670636 is about 25916.6092689611. The cubic root of 671670636 is about 875.7607038042.

The spelling of 671670636 in words is "six hundred seventy-one million, six hundred seventy thousand, six hundred thirty-six".