19907440578 has 16 divisors (see below), whose sum is σ = 44238756960. Its totient is φ = 6635813508.

The previous prime is 19907440561. The next prime is 19907440607. The reversal of 19907440578 is 87504470991.

19907440578 is a `hidden beast` number, since 19 + 90 + 74 + 405 + 78 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 368656307 = 19907440578 / (1 + 9 + 9 + 0 + 7 + 4 + 4 + 0 + 5 + 7 + 8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184328100 + ... + 184328207.

It is an arithmetic number, because the mean of its divisors is an integer number (2764922310).

Almost surely, 2^19907440578 is an apocalyptic number.

19907440578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19907440578 is an abundant number, since it is smaller than the sum of its proper divisors (24331316382).

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

19907440578 is a wasteful number, since it uses less digits than its factorization.

19907440578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368656318 (or 368656312 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 19907440578 in words is "nineteen billion, nine hundred seven million, four hundred forty thousand, five hundred seventy-eight".