671394240 has 168 divisors, whose sum is σ = 2519373168. Its totient is φ = 162754560.

The previous prime is 671394239. The next prime is 671394281. The reversal of 671394240 is 42493176.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 671394195 and 671394204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21084 + ... + 42276.

Almost surely, 2^671394240 is an apocalyptic number.

671394240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671394240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1259686584).

671394240 is an abundant number, since it is smaller than the sum of its proper divisors (1847978928).

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

671394240 is a wasteful number, since it uses less digits than its factorization.

671394240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21227 (or 21214 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 671394240 is about 25911.2763097459. The cubic root of 671394240 is about 875.6405606107.

The spelling of 671394240 in words is "six hundred seventy-one million, three hundred ninety-four thousand, two hundred forty".