1640363650 has 24 divisors (see below), whose sum is σ = 3052169604. Its totient is φ = 655910400.

The previous prime is 1640363617. The next prime is 1640363653. The reversal of 1640363650 is 563630461.

It can be written as a sum of positive squares in 6 ways, for example, as 135932281 + 1504431369 = 11659^2 + 38787^2 .

It is not an unprimeable number, because it can be changed into a prime (1640363653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224454 + ... + 231646.

Almost surely, 2^1640363650 is an apocalyptic number.

1640363650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640363650 is a deficient number, since it is larger than the sum of its proper divisors (1411805954).

1640363650 is a wasteful number, since it uses less digits than its factorization.

1640363650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11766 (or 11761 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 1640363650 is about 40501.4030621163. The cubic root of 1640363650 is about 1179.3608647402.

The spelling of 1640363650 in words is "one billion, six hundred forty million, three hundred sixty-three thousand, six hundred fifty".