640030248 has 160 divisors (see below), whose sum is σ = 2106387360. Its totient is φ = 179003520.

The previous prime is 640030243. The next prime is 640030249. The reversal of 640030248 is 842030046.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640030243) 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 39 ways as a sum of consecutive naturals, for example, 89211 + ... + 96117.

It is an arithmetic number, because the mean of its divisors is an integer number (13164921).

Almost surely, 2^640030248 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 640030248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1053193680).

640030248 is an abundant number, since it is smaller than the sum of its proper divisors (1466357112).

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

640030248 is a wasteful number, since it uses less digits than its factorization.

640030248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6949 (or 6936 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 640030248 is about 25298.8191028751. The cubic root of 640030248 is about 861.7874523281.

The spelling of 640030248 in words is "six hundred forty million, thirty thousand, two hundred forty-eight".