640436226 has 8 divisors (see below), whose sum is σ = 1280872464. Its totient is φ = 213478740.

The previous prime is 640436207. The next prime is 640436299. The reversal of 640436226 is 622634046.

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

640436226 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53369680 + ... + 53369691.

It is an arithmetic number, because the mean of its divisors is an integer number (160109058).

Almost surely, 2^640436226 is an apocalyptic number.

640436226 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

640436226 is a wasteful number, since it uses less digits than its factorization.

640436226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106739376.

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 640436226 is about 25306.8414860488. The cubic root of 640436226 is about 861.9696274669.

The spelling of 640436226 in words is "six hundred forty million, four hundred thirty-six thousand, two hundred twenty-six".