11915473720 has 96 divisors (see below), whose sum is σ = 28338664320. Its totient is φ = 4504308480.

The previous prime is 11915473693. The next prime is 11915473721. The reversal of 11915473720 is 2737451911.

It is a happy number.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11915473721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2290162 + ... + 2295358.

It is an arithmetic number, because the mean of its divisors is an integer number (295194420).

Almost surely, 2^11915473720 is an apocalyptic number.

11915473720 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 11915473720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14169332160).

11915473720 is an abundant number, since it is smaller than the sum of its proper divisors (16423190600).

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

11915473720 is a wasteful number, since it uses less digits than its factorization.

11915473720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5325 (or 5278 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 40.

The spelling of 11915473720 in words is "eleven billion, nine hundred fifteen million, four hundred seventy-three thousand, seven hundred twenty".