671959890 has 192 divisors, whose sum is σ = 2133331200. Its totient is φ = 143327232.

The previous prime is 671959889. The next prime is 671959891. The reversal of 671959890 is 98959176.

It is an interprime number because it is at equal distance from previous prime (671959889) and next prime (671959891).

It is not an unprimeable number, because it can be changed into a prime (671959891) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 873426 + ... + 874194.

It is an arithmetic number, because the mean of its divisors is an integer number (11111100).

Almost surely, 2^671959890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671959890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1066665600).

671959890 is an abundant number, since it is smaller than the sum of its proper divisors (1461371310).

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

671959890 is a wasteful number, since it uses less digits than its factorization.

671959890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881 (or 878 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 54.

The square root of 671959890 is about 25922.1891436661. The cubic root of 671959890 is about 875.8864007943.

The spelling of 671959890 in words is "six hundred seventy-one million, nine hundred fifty-nine thousand, eight hundred ninety".