19444278490 has 96 divisors (see below), whose sum is σ = 45260619264. Its totient is φ = 5955223680.

The previous prime is 19444278481. The next prime is 19444278551. The reversal of 19444278490 is 9487244491.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148237 + ... + 246703.

It is an arithmetic number, because the mean of its divisors is an integer number (471464784).

Almost surely, 2^19444278490 is an apocalyptic number.

19444278490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19444278490 is an abundant number, since it is smaller than the sum of its proper divisors (25816340774).

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

19444278490 is a wasteful number, since it uses less digits than its factorization.

19444278490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98532 (or 98525 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 52.

The spelling of 19444278490 in words is "nineteen billion, four hundred forty-four million, two hundred seventy-eight thousand, four hundred ninety".