646673760 has 192 divisors, whose sum is σ = 2286144000. Its totient is φ = 170712576.

The previous prime is 646673747. The next prime is 646673777. The reversal of 646673760 is 67376646.

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 31 ways as a sum of consecutive naturals, for example, 461541 + ... + 462939.

It is an arithmetic number, because the mean of its divisors is an integer number (11907000).

Almost surely, 2^646673760 is an apocalyptic number.

646673760 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 646673760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1143072000).

646673760 is an abundant number, since it is smaller than the sum of its proper divisors (1639470240).

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

646673760 is a wasteful number, since it uses less digits than its factorization.

646673760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530 (or 1516 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 45.

The square root of 646673760 is about 25429.7809664181. The cubic root of 646673760 is about 864.7589781445.

The spelling of 646673760 in words is "six hundred forty-six million, six hundred seventy-three thousand, seven hundred sixty".