646699273280 has 112 divisors (see below), whose sum is σ = 1592465785344. Its totient is φ = 249888399360.

The previous prime is 646699273277. The next prime is 646699273309. The reversal of 646699273280 is 82372996646.

It is a Harshad number since it is a multiple of its sum of digits (62).

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, 5527064 + ... + 5642856.

It is an arithmetic number, because the mean of its divisors is an integer number (14218444512).

Almost surely, 2^646699273280 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 646699273280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (796232892672).

646699273280 is an abundant number, since it is smaller than the sum of its proper divisors (945766512064).

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

646699273280 is a wasteful number, since it uses less digits than its factorization.

646699273280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116404 (or 116394 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 62.

The spelling of 646699273280 in words is "six hundred forty-six billion, six hundred ninety-nine million, two hundred seventy-three thousand, two hundred eighty".