640063524 has 48 divisors (see below), whose sum is σ = 1549437120. Its totient is φ = 205403520.

The previous prime is 640063493. The next prime is 640063577. The reversal of 640063524 is 425360046.

It is a junction number, because it is equal to n+sod(n) for n = 640063491 and 640063500.

It is an unprimeable number.

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, 127339 + ... + 132269.

It is an arithmetic number, because the mean of its divisors is an integer number (32279940).

Almost surely, 2^640063524 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 640063524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (774718560).

640063524 is an abundant number, since it is smaller than the sum of its proper divisors (909373596).

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

640063524 is a wasteful number, since it uses less digits than its factorization.

640063524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5340 (or 5338 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 640063524 is about 25299.4767534825. The cubic root of 640063524 is about 861.8023872172.

The spelling of 640063524 in words is "six hundred forty million, sixty-three thousand, five hundred twenty-four".