646790880 has 48 divisors (see below), whose sum is σ = 2037392784. Its totient is φ = 172477440.

The previous prime is 646790861. The next prime is 646790897. The reversal of 646790880 is 88097646.

646790880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673261 + ... + 674220.

It is an arithmetic number, because the mean of its divisors is an integer number (42445683).

Almost surely, 2^646790880 is an apocalyptic number.

646790880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646790880 is an abundant number, since it is smaller than the sum of its proper divisors (1390601904).

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

646790880 is a wasteful number, since it uses less digits than its factorization.

646790880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1347499 (or 1347491 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 646790880 is about 25432.0836739737. The cubic root of 646790880 is about 864.8111809006.

The spelling of 646790880 in words is "six hundred forty-six million, seven hundred ninety thousand, eight hundred eighty".