1640623332 has 12 divisors (see below), whose sum is σ = 3828121136. Its totient is φ = 546874440.

The previous prime is 1640623319. The next prime is 1640623339. The reversal of 1640623332 is 2333260461.

1640623332 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1640623332.

It is not an unprimeable number, because it can be changed into a prime (1640623339) 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, 68359294 + ... + 68359317.

Almost surely, 2^1640623332 is an apocalyptic number.

1640623332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1640623332 is an abundant number, since it is smaller than the sum of its proper divisors (2187497804).

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

1640623332 is a wasteful number, since it uses less digits than its factorization.

1640623332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136718618 (or 136718616 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 1640623332 is about 40504.6087748049. The cubic root of 1640623332 is about 1179.4230953780.

Adding to 1640623332 its reverse (2333260461), we get a palindrome (3973883793).

The spelling of 1640623332 in words is "one billion, six hundred forty million, six hundred twenty-three thousand, three hundred thirty-two".