640719192 has 16 divisors (see below), whose sum is σ = 1601798040. Its totient is φ = 213573056.

The previous prime is 640719187. The next prime is 640719199. The reversal of 640719192 is 291917046.

It is a self number, because there is not a number n which added to its sum of digits gives 640719192.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640719199) 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, 13348293 + ... + 13348340.

Almost surely, 2^640719192 is an apocalyptic number.

It is an amenable number.

640719192 is an abundant number, since it is smaller than the sum of its proper divisors (961078848).

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

640719192 is a wasteful number, since it uses less digits than its factorization.

640719192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26696642 (or 26696638 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 640719192 is about 25312.4315702779. The cubic root of 640719192 is about 862.0965577134.

The spelling of 640719192 in words is "six hundred forty million, seven hundred nineteen thousand, one hundred ninety-two".