19530726978 has 32 divisors (see below), whose sum is σ = 44645806080. Its totient is φ = 5579689680.

The previous prime is 19530726967. The next prime is 19530726991. The reversal of 19530726978 is 87962703591.

It is a Curzon 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, 855573 + ... + 878103.

It is an arithmetic number, because the mean of its divisors is an integer number (1395181440).

Almost surely, 2^19530726978 is an apocalyptic number.

19530726978 is an abundant number, since it is smaller than the sum of its proper divisors (25115079102).

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

19530726978 is a wasteful number, since it uses less digits than its factorization.

19530726978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43182.

The product of its (nonzero) digits is 5715360, while the sum is 57.

The spelling of 19530726978 in words is "nineteen billion, five hundred thirty million, seven hundred twenty-six thousand, nine hundred seventy-eight".