671987136 has 112 divisors (see below), whose sum is σ = 1953158400. Its totient is φ = 202954752.

The previous prime is 671987111. The next prime is 671987177. The reversal of 671987136 is 631789176.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79900 + ... + 87908.

Almost surely, 2^671987136 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 671987136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (976579200).

671987136 is an abundant number, since it is smaller than the sum of its proper divisors (1281171264).

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

671987136 is a wasteful number, since it uses less digits than its factorization.

671987136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8066 (or 8056 counting only the distinct ones).

The product of its digits is 381024, while the sum is 48.

The square root of 671987136 is about 25922.7146726573. The cubic root of 671987136 is about 875.8982388413.

The spelling of 671987136 in words is "six hundred seventy-one million, nine hundred eighty-seven thousand, one hundred thirty-six".