15809897964 has 96 divisors (see below), whose sum is σ = 44329291776. Its totient is φ = 4287666240.

The previous prime is 15809897927. The next prime is 15809897969. The reversal of 15809897964 is 46979890851.

It is a junction number, because it is equal to n+sod(n) for n = 15809897895 and 15809897904.

It is not an unprimeable number, because it can be changed into a prime (15809897969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221859 + ... + 284325.

It is an arithmetic number, because the mean of its divisors is an integer number (461763456).

Almost surely, 2^15809897964 is an apocalyptic number.

15809897964 is a gapful number since it is divisible by the number (14) 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 15809897964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22164645888).

15809897964 is an abundant number, since it is smaller than the sum of its proper divisors (28519393812).

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

15809897964 is a wasteful number, since it uses less digits than its factorization.

15809897964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62635 (or 62633 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 66.

The spelling of 15809897964 in words is "fifteen billion, eight hundred nine million, eight hundred ninety-seven thousand, nine hundred sixty-four".