640184976 has 120 divisors (see below), whose sum is σ = 1876754880. Its totient is φ = 203443968.

The previous prime is 640184969. The next prime is 640184977. The reversal of 640184976 is 679481046.

It is a super-2 number, since 2×640184976² = 819673606992241152, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640184977) 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 23 ways as a sum of consecutive naturals, for example, 345685 + ... + 347531.

It is an arithmetic number, because the mean of its divisors is an integer number (15639624).

Almost surely, 2^640184976 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640184976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938377440).

640184976 is an abundant number, since it is smaller than the sum of its proper divisors (1236569904).

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

640184976 is a wasteful number, since it uses less digits than its factorization.

640184976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973 (or 1964 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 640184976 is about 25301.8769264258. The cubic root of 640184976 is about 861.8568927468.

The spelling of 640184976 in words is "six hundred forty million, one hundred eighty-four thousand, nine hundred seventy-six".