1638850680 has 48 divisors (see below), whose sum is σ = 5326265880. Its totient is φ = 437026752.

The previous prime is 1638850679. The next prime is 1638850691. The reversal of 1638850680 is 860588361.

1638850680 is a `hidden beast` number, since 1 + 63 + 8 + 8 + 506 + 80 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2275822 + ... + 2276541.

Almost surely, 2^1638850680 is an apocalyptic number.

1638850680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1638850680 is an abundant number, since it is smaller than the sum of its proper divisors (3687415200).

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

1638850680 is a wasteful number, since it uses less digits than its factorization.

1638850680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4552380 (or 4552373 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1638850680 is about 40482.7207583680. The cubic root of 1638850680 is about 1178.9981633607.

The spelling of 1638850680 in words is "one billion, six hundred thirty-eight million, eight hundred fifty thousand, six hundred eighty".