11320023440 has 80 divisors (see below), whose sum is σ = 28996197696. Its totient is φ = 4075584000.

The previous prime is 11320023439. The next prime is 11320023467. The reversal of 11320023440 is 4432002311.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×11320023440³ (a number of 31 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25199 + ... + 152561.

Almost surely, 2^11320023440 is an apocalyptic number.

11320023440 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 11320023440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14498098848).

11320023440 is an abundant number, since it is smaller than the sum of its proper divisors (17676174256).

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

11320023440 is a wasteful number, since it uses less digits than its factorization.

11320023440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127488 (or 127482 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 11320023440 its reverse (4432002311), we get a palindrome (15752025751).

The spelling of 11320023440 in words is "eleven billion, three hundred twenty million, twenty-three thousand, four hundred forty".