15263212440 has 128 divisors (see below), whose sum is σ = 52594560000. Its totient is φ = 3471164928.

The previous prime is 15263212439. The next prime is 15263212457. The reversal of 15263212440 is 4421236251.

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 = 15263212398 and 15263212407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121506 + ... + 212814.

It is an arithmetic number, because the mean of its divisors is an integer number (410895000).

Almost surely, 2^15263212440 is an apocalyptic number.

15263212440 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 15263212440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26297280000).

15263212440 is an abundant number, since it is smaller than the sum of its proper divisors (37331347560).

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

15263212440 is a wasteful number, since it uses less digits than its factorization.

15263212440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91529 (or 91525 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

Adding to 15263212440 its reverse (4421236251), we get a palindrome (19684448691).

The spelling of 15263212440 in words is "fifteen billion, two hundred sixty-three million, two hundred twelve thousand, four hundred forty".