646876740 has 48 divisors (see below), whose sum is σ = 1836777600. Its totient is φ = 170069760.

The previous prime is 646876723. The next prime is 646876753. The reversal of 646876740 is 47678646.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 646876740.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71665 + ... + 80184.

It is an arithmetic number, because the mean of its divisors is an integer number (38266200).

Almost surely, 2^646876740 is an apocalyptic number.

646876740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646876740 is an abundant number, since it is smaller than the sum of its proper divisors (1189900860).

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

646876740 is a wasteful number, since it uses less digits than its factorization.

646876740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151932 (or 151930 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 48.

The square root of 646876740 is about 25433.7716432306. The cubic root of 646876740 is about 864.8494464384.

The spelling of 646876740 in words is "six hundred forty-six million, eight hundred seventy-six thousand, seven hundred forty".