19138440017628 has 48 divisors (see below), whose sum is σ = 49619607744000. Its totient is φ = 6379296159024.

The previous prime is 19138440017563. The next prime is 19138440017639. The reversal of 19138440017628 is 82671004483191.

19138440017628 is a `hidden beast` number, since 1 + 9 + 1 + 3 + 8 + 4 + 4 + 0 + 0 + 1 + 7 + 628 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1237453 + ... + 6309371.

It is an arithmetic number, because the mean of its divisors is an integer number (1033741828000).

Almost surely, 2^{19138440017628} is an apocalyptic number.

19138440017628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19138440017628 is an abundant number, since it is smaller than the sum of its proper divisors (30481167726372).

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

19138440017628 is a wasteful number, since it uses less digits than its factorization.

19138440017628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106871 (or 5106863 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 19138440017628 in words is "nineteen trillion, one hundred thirty-eight billion, four hundred forty million, seventeen thousand, six hundred twenty-eight".