19780102836 has 144 divisors (see below), whose sum is σ = 57364856640. Its totient is φ = 5696179200.

The previous prime is 19780102831. The next prime is 19780102843. The reversal of 19780102836 is 63820108791.

It is a junction number, because it is equal to n+sod(n) for n = 19780102791 and 19780102800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19780102831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 724636 + ... + 751436.

It is an arithmetic number, because the mean of its divisors is an integer number (398367060).

Almost surely, 2^19780102836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19780102836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28682428320).

19780102836 is an abundant number, since it is smaller than the sum of its proper divisors (37584753804).

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

19780102836 is a wasteful number, since it uses less digits than its factorization.

19780102836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26926 (or 26921 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The spelling of 19780102836 in words is "nineteen billion, seven hundred eighty million, one hundred two thousand, eight hundred thirty-six".