78281228453 has 4 divisors (see below), whose sum is σ = 78297814668. Its totient is φ = 78264642240.

The previous prime is 78281228437. The next prime is 78281228461. The reversal of 78281228453 is 35482218287.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36527618884 + 41753609569 = 191122^2 + 204337^2 .

It is a cyclic number.

It is not a de Polignac number, because 78281228453 - 2⁴ = 78281228437 is a prime.

It is a super-2 number, since 2×78281228453² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78281228413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8286026 + ... + 8295467.

It is an arithmetic number, because the mean of its divisors is an integer number (19574453667).

Almost surely, 2^78281228453 is an apocalyptic number.

It is an amenable number.

78281228453 is a deficient number, since it is larger than the sum of its proper divisors (16586215).

78281228453 is a wasteful number, since it uses less digits than its factorization.

78281228453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16586214.

The product of its digits is 1720320, while the sum is 50.

The spelling of 78281228453 in words is "seventy-eight billion, two hundred eighty-one million, two hundred twenty-eight thousand, four hundred fifty-three".