15442378812 has 216 divisors, whose sum is σ = 48613393920. Its totient is φ = 4269373920.

The previous prime is 15442378769. The next prime is 15442378813. The reversal of 15442378812 is 21887324451.

15442378812 is a `hidden beast` number, since 1 + 544 + 23 + 7 + 8 + 81 + 2 = 666.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15442378813) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1471239 + ... + 1481697.

Almost surely, 2^15442378812 is an apocalyptic number.

15442378812 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 15442378812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24306696960).

15442378812 is an abundant number, since it is smaller than the sum of its proper divisors (33171015108).

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

15442378812 is a wasteful number, since it uses less digits than its factorization.

15442378812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10523 (or 10502 counting only the distinct ones).

The product of its digits is 430080, while the sum is 45.

The spelling of 15442378812 in words is "fifteen billion, four hundred forty-two million, three hundred seventy-eight thousand, eight hundred twelve".