640011250 has 20 divisors (see below), whose sum is σ = 1199639430. Its totient is φ = 256004000.

The previous prime is 640011241. The next prime is 640011259. The reversal of 640011250 is 52110046.

It is an interprime number because it is at equal distance from previous prime (640011241) and next prime (640011259).

It can be written as a sum of positive squares in 5 ways, for example, as 127396369 + 512614881 = 11287^2 + 22641^2 .

It is a super-2 number, since 2×640011250² = 819228800253125000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640011259) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 254755 + ... + 257254.

Almost surely, 2^640011250 is an apocalyptic number.

640011250 is a deficient number, since it is larger than the sum of its proper divisors (559628180).

640011250 is an equidigital number, since it uses as much as digits as its factorization.

640011250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512031 (or 512016 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 640011250 is about 25298.4436280179. The cubic root of 640011250 is about 861.7789254395.

Adding to 640011250 its reverse (52110046), we get a palindrome (692121296).

The spelling of 640011250 in words is "six hundred forty million, eleven thousand, two hundred fifty".