640246822 has 8 divisors (see below), whose sum is σ = 960757272. Its totient is φ = 319994400.

The previous prime is 640246807. The next prime is 640246829. The reversal of 640246822 is 228642046.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640246829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58179 + ... + 68302.

It is an arithmetic number, because the mean of its divisors is an integer number (120094659).

Almost surely, 2^640246822 is an apocalyptic number.

640246822 is a deficient number, since it is larger than the sum of its proper divisors (320510450).

640246822 is a wasteful number, since it uses less digits than its factorization.

640246822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129014.

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 640246822 is about 25303.0990592062. The cubic root of 640246822 is about 861.8846454990.

Adding to 640246822 its reverse (228642046), we get a palindrome (868888868).

The spelling of 640246822 in words is "six hundred forty million, two hundred forty-six thousand, eight hundred twenty-two".