640264798 has 8 divisors (see below), whose sum is σ = 986353992. Its totient is φ = 311480136.

The previous prime is 640264783. The next prime is 640264817. The reversal of 640264798 is 897462046.

It is a happy number.

640264798 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent 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, 4326040 + ... + 4326187.

It is an arithmetic number, because the mean of its divisors is an integer number (123294249).

Almost surely, 2^640264798 is an apocalyptic number.

640264798 is a deficient number, since it is larger than the sum of its proper divisors (346089194).

640264798 is a wasteful number, since it uses less digits than its factorization.

640264798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8652266.

The product of its (nonzero) digits is 580608, while the sum is 46.

The square root of 640264798 is about 25303.4542701189. The cubic root of 640264798 is about 861.8927117077.

The spelling of 640264798 in words is "six hundred forty million, two hundred sixty-four thousand, seven hundred ninety-eight".