646067880 has 128 divisors (see below), whose sum is σ = 2194387200. Its totient is φ = 169019136.

The previous prime is 646067867. The next prime is 646067893. The reversal of 646067880 is 88760646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (646067867) and next prime (646067893).

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

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, 51597 + ... + 62883.

It is an arithmetic number, because the mean of its divisors is an integer number (17143650).

Almost surely, 2^646067880 is an apocalyptic number.

646067880 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 646067880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097193600).

646067880 is an abundant number, since it is smaller than the sum of its proper divisors (1548319320).

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

646067880 is a wasteful number, since it uses less digits than its factorization.

646067880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11360 (or 11350 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 646067880 is about 25417.8653706404. The cubic root of 646067880 is about 864.4888244663.

The spelling of 646067880 in words is "six hundred forty-six million, sixty-seven thousand, eight hundred eighty".