640696182 has 32 divisors (see below), whose sum is σ = 1466076672. Its totient is φ = 182852544.

The previous prime is 640696157. The next prime is 640696183. The reversal of 640696182 is 281696046.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640696183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32023 + ... + 48029.

It is an arithmetic number, because the mean of its divisors is an integer number (45814896).

Almost surely, 2^640696182 is an apocalyptic number.

640696182 is an abundant number, since it is smaller than the sum of its proper divisors (825380490).

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

640696182 is a wasteful number, since it uses less digits than its factorization.

640696182 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16972.

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 640696182 is about 25311.9770464498. The cubic root of 640696182 is about 862.0862374985.

The spelling of 640696182 in words is "six hundred forty million, six hundred ninety-six thousand, one hundred eighty-two".