1636649950 has 48 divisors (see below), whose sum is σ = 3302444880. Its totient is φ = 599857920.

The previous prime is 1636649923. The next prime is 1636649951. The reversal of 1636649950 is 599466361.

It is a junction number, because it is equal to n+sod(n) for n = 1636649894 and 1636649903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1636649951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79861 + ... + 98239.

It is an arithmetic number, because the mean of its divisors is an integer number (68800935).

Almost surely, 2^1636649950 is an apocalyptic number.

1636649950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1636649950 is an abundant number, since it is smaller than the sum of its proper divisors (1665794930).

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

1636649950 is a wasteful number, since it uses less digits than its factorization.

1636649950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18541 (or 18536 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 1636649950 is about 40455.5305242682. The cubic root of 1636649950 is about 1178.4701878841.

The spelling of 1636649950 in words is "one billion, six hundred thirty-six million, six hundred forty-nine thousand, nine hundred fifty".