19431287064 has 96 divisors (see below), whose sum is σ = 62759473920. Its totient is φ = 5310410688.

The previous prime is 19431287063. The next prime is 19431287093. The reversal of 19431287064 is 46078213491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19431287063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 826542 + ... + 849725.

It is an arithmetic number, because the mean of its divisors is an integer number (653744520).

Almost surely, 2^19431287064 is an apocalyptic number.

19431287064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19431287064 is an abundant number, since it is smaller than the sum of its proper divisors (43328186856).

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

19431287064 is a wasteful number, since it uses less digits than its factorization.

19431287064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676309 (or 1676302 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 19431287064 in words is "nineteen billion, four hundred thirty-one million, two hundred eighty-seven thousand, sixty-four".