15809808420 has 672 divisors, whose sum is σ = 62050222080. Its totient is φ = 3300445440.

The previous prime is 15809808383. The next prime is 15809808449. The reversal of 15809808420 is 2480890851.

It is a happy number.

It is a super-3 number, since 3×15809808420³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 60113209 + ... + 60113471.

It is an arithmetic number, because the mean of its divisors is an integer number (92336640).

Almost surely, 2^15809808420 is an apocalyptic number.

15809808420 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 15809808420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31025111040).

15809808420 is an abundant number, since it is smaller than the sum of its proper divisors (46240413660).

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

15809808420 is a wasteful number, since it uses less digits than its factorization.

15809808420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The spelling of 15809808420 in words is "fifteen billion, eight hundred nine million, eight hundred eight thousand, four hundred twenty".