15445878480 has 60 divisors (see below), whose sum is σ = 51872410980. Its totient is φ = 4118900736.

The previous prime is 15445878473. The next prime is 15445878493. The reversal of 15445878480 is 8487854451.

15445878480 is a `hidden beast` number, since 1 + 5 + 44 + 58 + 78 + 480 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11848757904 + 3597120576 = 108852^2 + 59976^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×15445878480² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10725585 + ... + 10727024.

It is an arithmetic number, because the mean of its divisors is an integer number (864540183).

Almost surely, 2^15445878480 is an apocalyptic number.

15445878480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15445878480 is an abundant number, since it is smaller than the sum of its proper divisors (36426532500).

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

15445878480 is a wasteful number, since it uses less digits than its factorization.

15445878480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21452628 (or 21452619 counting only the distinct ones).

The product of its (nonzero) digits is 5734400, while the sum is 54.

The spelling of 15445878480 in words is "fifteen billion, four hundred forty-five million, eight hundred seventy-eight thousand, four hundred eighty".