19621442790 has 48 divisors (see below), whose sum is σ = 51492559248. Its totient is φ = 5183481408.

The previous prime is 19621442773. The next prime is 19621442791. The reversal of 19621442790 is 9724412691.

19621442790 is a `hidden beast` number, since 1 + 9 + 6 + 214 + 427 + 9 + 0 = 666.

It is a super-2 number, since 2×19621442790² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19621442791) 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, 1009137 + ... + 1028396.

It is an arithmetic number, because the mean of its divisors is an integer number (1072761651).

Almost surely, 2^19621442790 is an apocalyptic number.

19621442790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19621442790 is an abundant number, since it is smaller than the sum of its proper divisors (31871116458).

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

19621442790 is a wasteful number, since it uses less digits than its factorization.

19621442790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037653 (or 2037650 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 19621442790 in words is "nineteen billion, six hundred twenty-one million, four hundred forty-two thousand, seven hundred ninety".