671222538 has 80 divisors (see below), whose sum is σ = 1809424320. Its totient is φ = 181678464.

The previous prime is 671222533. The next prime is 671222597. The reversal of 671222538 is 835222176.

It is a super-2 number, since 2×671222538² = 901079391038322888, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (671222533) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 5970 + ... + 37122.

It is an arithmetic number, because the mean of its divisors is an integer number (22617804).

Almost surely, 2^671222538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671222538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (904712160).

671222538 is an abundant number, since it is smaller than the sum of its proper divisors (1138201782).

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

671222538 is a wasteful number, since it uses less digits than its factorization.

671222538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31193 (or 31184 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 671222538 is about 25907.9628299872. The cubic root of 671222538 is about 875.5659089653.

The spelling of 671222538 in words is "six hundred seventy-one million, two hundred twenty-two thousand, five hundred thirty-eight".