671065560 has 320 divisors, whose sum is σ = 2592691200. Its totient is φ = 153964800.

The previous prime is 671065553. The next prime is 671065561. The reversal of 671065560 is 65560176.

It is a happy number.

It is a super-2 number, since 2×671065560² = 900657971636227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671065561) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 676665 + ... + 677655.

It is an arithmetic number, because the mean of its divisors is an integer number (8102160).

Almost surely, 2^671065560 is an apocalyptic number.

671065560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671065560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1296345600).

671065560 is an abundant number, since it is smaller than the sum of its proper divisors (1921625640).

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

671065560 is a wasteful number, since it uses less digits than its factorization.

671065560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1031 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 671065560 is about 25904.9331209328. The cubic root of 671065560 is about 875.4976477983.

The spelling of 671065560 in words is "six hundred seventy-one million, sixty-five thousand, five hundred sixty".