646988460 has 48 divisors (see below), whose sum is σ = 1812685056. Its totient is φ = 172423872.

The previous prime is 646988453. The next prime is 646988467. The reversal of 646988460 is 64889646.

It is an interprime number because it is at equal distance from previous prime (646988453) and next prime (646988467).

It is not an unprimeable number, because it can be changed into a prime (646988467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166257 + ... + 170103.

It is an arithmetic number, because the mean of its divisors is an integer number (37764272).

Almost surely, 2^646988460 is an apocalyptic number.

646988460 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646988460 is an abundant number, since it is smaller than the sum of its proper divisors (1165696596).

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

646988460 is a wasteful number, since it uses less digits than its factorization.

646988460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6662 (or 6660 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 51.

The square root of 646988460 is about 25435.9678408352. The cubic root of 646988460 is about 864.8992320273.

The spelling of 646988460 in words is "six hundred forty-six million, nine hundred eighty-eight thousand, four hundred sixty".