640264446 has 32 divisors (see below), whose sum is σ = 1457517600. Its totient is φ = 208215360.

The previous prime is 640264423. The next prime is 640264463. The reversal of 640264446 is 644462046.

It is a happy number.

640264446 is a `hidden beast` number, since 6 + 4 + 0 + 2 + 644 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 640264446.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142381 + ... + 146808.

It is an arithmetic number, because the mean of its divisors is an integer number (45547425).

Almost surely, 2^640264446 is an apocalyptic number.

640264446 is an abundant number, since it is smaller than the sum of its proper divisors (817253154).

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

640264446 is a wasteful number, since it uses less digits than its factorization.

640264446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289241 (or 289235 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

The square root of 640264446 is about 25303.4473145459. The cubic root of 640264446 is about 861.8925537593.

The spelling of 640264446 in words is "six hundred forty million, two hundred sixty-four thousand, four hundred forty-six".