101808787920 has 320 divisors, whose sum is σ = 379268296704. Its totient is φ = 22087802880.

The previous prime is 101808787907. The next prime is 101808787939. The reversal of 101808787920 is 29787808101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5051784 + ... + 5071896.

Almost surely, 2^101808787920 is an apocalyptic number.

101808787920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 101808787920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (189634148352).

101808787920 is an abundant number, since it is smaller than the sum of its proper divisors (277459508784).

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

101808787920 is a wasteful number, since it uses less digits than its factorization.

101808787920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20290 (or 20284 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 51.

The spelling of 101808787920 in words is "one hundred one billion, eight hundred eight million, seven hundred eighty-seven thousand, nine hundred twenty".