19440906768 has 80 divisors (see below), whose sum is σ = 58228832640. Its totient is φ = 6198546816.

The previous prime is 19440906763. The next prime is 19440906803. The reversal of 19440906768 is 86760904491.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (19440906763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 968371 + ... + 988242.

It is an arithmetic number, because the mean of its divisors is an integer number (727860408).

Almost surely, 2^19440906768 is an apocalyptic number.

19440906768 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19440906768 is an abundant number, since it is smaller than the sum of its proper divisors (38787925872).

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

19440906768 is a wasteful number, since it uses less digits than its factorization.

19440906768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956653 (or 1956641 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 54.

The spelling of 19440906768 in words is "nineteen billion, four hundred forty million, nine hundred six thousand, seven hundred sixty-eight".