671978244 has 96 divisors (see below), whose sum is σ = 1997291520. Its totient is φ = 171182592.

The previous prime is 671978207. The next prime is 671978249. The reversal of 671978244 is 442879176.

It is a junction number, because it is equal to n+sod(n) for n = 671978193 and 671978202.

It is not an unprimeable number, because it can be changed into a prime (671978249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14749 + ... + 39515.

It is an arithmetic number, because the mean of its divisors is an integer number (20805120).

Almost surely, 2^671978244 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 671978244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998645760).

671978244 is an abundant number, since it is smaller than the sum of its proper divisors (1325313276).

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

671978244 is a wasteful number, since it uses less digits than its factorization.

671978244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24817 (or 24815 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 671978244 is about 25922.5431622748. The cubic root of 671978244 is about 875.8943754134.

The spelling of 671978244 in words is "six hundred seventy-one million, nine hundred seventy-eight thousand, two hundred forty-four".