671564136 has 64 divisors (see below), whose sum is σ = 1749729600. Its totient is φ = 214527488.

The previous prime is 671564111. The next prime is 671564147. The reversal of 671564136 is 631465176.

It is a super-2 number, since 2×671564136² = 901996777522852992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671564094 and 671564103.

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, 91831 + ... + 98873.

It is an arithmetic number, because the mean of its divisors is an integer number (27339525).

Almost surely, 2^671564136 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 671564136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (874864800).

671564136 is an abundant number, since it is smaller than the sum of its proper divisors (1078165464).

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

671564136 is a wasteful number, since it uses less digits than its factorization.

671564136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7218 (or 7214 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 671564136 is about 25914.5545205778. The cubic root of 671564136 is about 875.7144145269.

The spelling of 671564136 in words is "six hundred seventy-one million, five hundred sixty-four thousand, one hundred thirty-six".