670985172 has 324 divisors, whose sum is σ = 2184785148. Its totient is φ = 172339200.

The previous prime is 670985167. The next prime is 670985179. The reversal of 670985172 is 271589076.

It can be written as a sum of positive squares in 6 ways, for example, as 21958596 + 649026576 = 4686^2 + 25476^2 .

It is a super-2 number, since 2×670985172² = 900442202087739168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670985179) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 16365472 + ... + 16365512.

Almost surely, 2^670985172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 670985172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1092392574).

670985172 is an abundant number, since it is smaller than the sum of its proper divisors (1513799976).

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

670985172 is a wasteful number, since it uses less digits than its factorization.

670985172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 670985172 is about 25903.3814781005. The cubic root of 670985172 is about 875.4626873217.

The spelling of 670985172 in words is "six hundred seventy million, nine hundred eighty-five thousand, one hundred seventy-two".