78244821888278 has 12 divisors (see below), whose sum is σ = 120299668161180. Its totient is φ = 38168205797520.

The previous prime is 78244821888269. The next prime is 78244821888349. The reversal of 78244821888278 is 87288812844287.

It is a super-2 number, since 2×78244821888278² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78244821888199 and 78244821888208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11636644748 + ... + 11636651471.

It is an arithmetic number, because the mean of its divisors is an integer number (10024972346765).

Almost surely, 2^{78244821888278} is an apocalyptic number.

78244821888278 is a deficient number, since it is larger than the sum of its proper divisors (42054846272902).

78244821888278 is a wasteful number, since it uses less digits than its factorization.

78244821888278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23273296303 (or 23273296262 counting only the distinct ones).

The product of its digits is 1644167168, while the sum is 77.

The spelling of 78244821888278 in words is "seventy-eight trillion, two hundred forty-four billion, eight hundred twenty-one million, eight hundred eighty-eight thousand, two hundred seventy-eight".