78421281444 has 81 divisors (see below), whose sum is σ = 217942267179. Its totient is φ = 23758423920.

The previous prime is 78421281427. The next prime is 78421281541. The reversal of 78421281444 is 44418212487.

The square root of 78421281444 is 280038.

It is a perfect power (a square), and thus also a powerful number.

78421281444 is a `hidden beast` number, since 7 + 84 + 2 + 128 + 1 + 444 = 666.

It is a super-2 number, since 2×78421281444² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78421281444.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18480387 + ... + 18484629.

Almost surely, 2^78421281444 is an apocalyptic number.

78421281444 is the 280038-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78421281444

78421281444 is an abundant number, since it is smaller than the sum of its proper divisors (139520985735).

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

78421281444 is a wasteful number, since it uses less digits than its factorization.

78421281444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8518 (or 4259 counting only the distinct ones).

The product of its digits is 458752, while the sum is 45.

The spelling of 78421281444 in words is "seventy-eight billion, four hundred twenty-one million, two hundred eighty-one thousand, four hundred forty-four".