15405787872 has 384 divisors, whose sum is σ = 50347422720. Its totient is φ = 4614838272.

The previous prime is 15405787823. The next prime is 15405787877. The reversal of 15405787872 is 27878750451.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15405787877) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27363463 + ... + 27364025.

It is an arithmetic number, because the mean of its divisors is an integer number (131113080).

Almost surely, 2^15405787872 is an apocalyptic number.

15405787872 is a gapful number since it is divisible by the number (12) 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 15405787872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25173711360).

15405787872 is an abundant number, since it is smaller than the sum of its proper divisors (34941634848).

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

15405787872 is an equidigital number, since it uses as much as digits as its factorization.

15405787872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 4390400, while the sum is 54.

The spelling of 15405787872 in words is "fifteen billion, four hundred five million, seven hundred eighty-seven thousand, eight hundred seventy-two".