671794560 has 160 divisors (see below), whose sum is σ = 2399284800. Its totient is φ = 179131392.

The previous prime is 671794537. The next prime is 671794589. The reversal of 671794560 is 65497176.

It is a happy number.

It is a Cunningham number, because it is equal to 25919²-1.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 45361 + ... + 58319.

It is an arithmetic number, because the mean of its divisors is an integer number (14995530).

Almost surely, 2^671794560 is an apocalyptic number.

671794560 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 671794560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1199642400).

671794560 is an abundant number, since it is smaller than the sum of its proper divisors (1727490240).

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

671794560 is a wasteful number, since it uses less digits than its factorization.

671794560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12990 (or 12969 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 671794560 is about 25918.9999807091. Note that the first 4 decimals coincide. The cubic root of 671794560 is about 875.8145601091.

The spelling of 671794560 in words is "six hundred seventy-one million, seven hundred ninety-four thousand, five hundred sixty".