19012988640 has 96 divisors (see below), whose sum is σ = 62494903296. Its totient is φ = 4849687040.

The previous prime is 19012988611. The next prime is 19012988641. The reversal of 19012988640 is 4688921091.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×19012988640² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 19012988640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19012988641) 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, 850056 + ... + 872135.

It is an arithmetic number, because the mean of its divisors is an integer number (650988576).

Almost surely, 2^19012988640 is an apocalyptic number.

19012988640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19012988640 is an abundant number, since it is smaller than the sum of its proper divisors (43481914656).

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

19012988640 is a wasteful number, since it uses less digits than its factorization.

19012988640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722232 (or 1722224 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 48.

The spelling of 19012988640 in words is "nineteen billion, twelve million, nine hundred eighty-eight thousand, six hundred forty".