640419360 has 192 divisors, whose sum is σ = 2406039552. Its totient is φ = 140000256.

The previous prime is 640419349. The next prime is 640419379. The reversal of 640419360 is 63914046.

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, 73137 + ... + 81423.

It is an arithmetic number, because the mean of its divisors is an integer number (12531456).

Almost surely, 2^640419360 is an apocalyptic number.

640419360 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 640419360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203019776).

640419360 is an abundant number, since it is smaller than the sum of its proper divisors (1765620192).

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

640419360 is a wasteful number, since it uses less digits than its factorization.

640419360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8335 (or 8327 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 640419360 is about 25306.5082538070. The cubic root of 640419360 is about 861.9620606935.

The spelling of 640419360 in words is "six hundred forty million, four hundred nineteen thousand, three hundred sixty".