15542778240 has 384 divisors, whose sum is σ = 61636723200. Its totient is φ = 3569356800.

The previous prime is 15542778179. The next prime is 15542778253. The reversal of 15542778240 is 4287724551.

15542778240 is a `hidden beast` number, since 1 + 554 + 2 + 7 + 78 + 24 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1197385 + ... + 1210295.

It is an arithmetic number, because the mean of its divisors is an integer number (160512300).

Almost surely, 2^15542778240 is an apocalyptic number.

15542778240 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 15542778240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30818361600).

15542778240 is an abundant number, since it is smaller than the sum of its proper divisors (46093944960).

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

15542778240 is a wasteful number, since it uses less digits than its factorization.

15542778240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12966 (or 12951 counting only the distinct ones).

The product of its (nonzero) digits is 627200, while the sum is 45.

The spelling of 15542778240 in words is "fifteen billion, five hundred forty-two million, seven hundred seventy-eight thousand, two hundred forty".