78273378289 has 8 divisors (see below), whose sum is σ = 80116515072. Its totient is φ = 76431279120.

The previous prime is 78273378263. The next prime is 78273378299. The reversal of 78273378289 is 98287337287.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78273378289 - 2²³ = 78264989681 is a prime.

It is a super-2 number, since 2×78273378289² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78273378289.

It is not an unprimeable number, because it can be changed into a prime (78273378299) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105697 + ... + 409534.

It is an arithmetic number, because the mean of its divisors is an integer number (10014564384).

Almost surely, 2^78273378289 is an apocalyptic number.

It is an amenable number.

78273378289 is a deficient number, since it is larger than the sum of its proper divisors (1843136783).

78273378289 is a wasteful number, since it uses less digits than its factorization.

78273378289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518807.

The product of its digits is 56899584, while the sum is 64.

The spelling of 78273378289 in words is "seventy-eight billion, two hundred seventy-three million, three hundred seventy-eight thousand, two hundred eighty-nine".