1640323356 has 48 divisors (see below), whose sum is σ = 4426915584. Its totient is φ = 463015296.

The previous prime is 1640323351. The next prime is 1640323357. The reversal of 1640323356 is 6533230461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640323351) 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, 110665 + ... + 124608.

It is an arithmetic number, because the mean of its divisors is an integer number (92227408).

Almost surely, 2^1640323356 is an apocalyptic number.

It is an amenable number.

1640323356 is an abundant number, since it is smaller than the sum of its proper divisors (2786592228).

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

1640323356 is a wasteful number, since it uses less digits than its factorization.

1640323356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235370 (or 235368 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 33.

The square root of 1640323356 is about 40500.9056195044. The cubic root of 1640323356 is about 1179.3512080287.

The spelling of 1640323356 in words is "one billion, six hundred forty million, three hundred twenty-three thousand, three hundred fifty-six".