15444022440 has 128 divisors (see below), whose sum is σ = 57764689920. Its totient is φ = 3209145600.

The previous prime is 15444022439. The next prime is 15444022493. The reversal of 15444022440 is 4422044451.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15444022398 and 15444022407.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 826476 + ... + 844955.

It is an arithmetic number, because the mean of its divisors is an integer number (451286640).

Almost surely, 2^15444022440 is an apocalyptic number.

15444022440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15444022440 is an abundant number, since it is smaller than the sum of its proper divisors (42320667480).

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

15444022440 is a wasteful number, since it uses less digits than its factorization.

15444022440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671463 (or 1671459 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 30.

Adding to 15444022440 its reverse (4422044451), we get a palindrome (19866066891).

The spelling of 15444022440 in words is "fifteen billion, four hundred forty-four million, twenty-two thousand, four hundred forty".