19440649672 has 32 divisors (see below), whose sum is σ = 38376720000. Its totient is φ = 9207044928.

The previous prime is 19440649663. The next prime is 19440649673. The reversal of 19440649672 is 27694604491.

It is not an unprimeable number, because it can be changed into a prime (19440649673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1317954 + ... + 1332622.

It is an arithmetic number, because the mean of its divisors is an integer number (1199272500).

Almost surely, 2^19440649672 is an apocalyptic number.

It is an amenable number.

19440649672 is a deficient number, since it is larger than the sum of its proper divisors (18936070328).

19440649672 is a wasteful number, since it uses less digits than its factorization.

19440649672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23413 (or 23409 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 19440649672 in words is "nineteen billion, four hundred forty million, six hundred forty-nine thousand, six hundred seventy-two".