640302124 has 48 divisors (see below), whose sum is σ = 1410151680. Its totient is φ = 247124160.

The previous prime is 640302119. The next prime is 640302151. The reversal of 640302124 is 421203046.

It is a happy number.

It is a super-2 number, since 2×640302124² = 819973619997822752, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 640302095 and 640302104.

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, 23242 + ... + 42670.

It is an arithmetic number, because the mean of its divisors is an integer number (29378160).

Almost surely, 2^640302124 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 640302124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (705075840).

640302124 is an abundant number, since it is smaller than the sum of its proper divisors (769849556).

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

640302124 is a wasteful number, since it uses less digits than its factorization.

640302124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19558 (or 19556 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 640302124 is about 25304.1918266520. The cubic root of 640302124 is about 861.9094601855.

The spelling of 640302124 in words is "six hundred forty million, three hundred two thousand, one hundred twenty-four".