1640336136 has 32 divisors (see below), whose sum is σ = 4196211360. Its totient is φ = 534062592.

The previous prime is 1640336119. The next prime is 1640336141. The reversal of 1640336136 is 6316330461.

It is a junction number, because it is equal to n+sod(n) for n = 1640336097 and 1640336106.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 793705 + ... + 795768.

It is an arithmetic number, because the mean of its divisors is an integer number (131131605).

Almost surely, 2^1640336136 is an apocalyptic number.

It is an amenable number.

1640336136 is an abundant number, since it is smaller than the sum of its proper divisors (2555875224).

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

1640336136 is a wasteful number, since it uses less digits than its factorization.

1640336136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589525 (or 1589521 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 33.

The square root of 1640336136 is about 40501.0633934468. The cubic root of 1640336136 is about 1179.3542708535.

Adding to 1640336136 its reverse (6316330461), we get a palindrome (7956666597).

The spelling of 1640336136 in words is "one billion, six hundred forty million, three hundred thirty-six thousand, one hundred thirty-six".