19994271672 has 64 divisors (see below), whose sum is σ = 52688592000. Its totient is φ = 6305330304.

The previous prime is 19994271607. The next prime is 19994271679. The reversal of 19994271672 is 27617249991.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19994271679) 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, 307318 + ... + 366650.

It is an arithmetic number, because the mean of its divisors is an integer number (823259250).

Almost surely, 2^19994271672 is an apocalyptic number.

19994271672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19994271672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26344296000).

19994271672 is an abundant number, since it is smaller than the sum of its proper divisors (32694320328).

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

19994271672 is a wasteful number, since it uses less digits than its factorization.

19994271672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60100 (or 60096 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 57.

The spelling of 19994271672 in words is "nineteen billion, nine hundred ninety-four million, two hundred seventy-one thousand, six hundred seventy-two".