78280666848 has 72 divisors (see below), whose sum is σ = 224905681728. Its totient is φ = 25824540672.

The previous prime is 78280666777. The next prime is 78280666861. The reversal of 78280666848 is 84866608287.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×78280666848² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1373136 + ... + 1429007.

It is an arithmetic number, because the mean of its divisors is an integer number (3123690024).

Almost surely, 2^78280666848 is an apocalyptic number.

It is an amenable number.

78280666848 is an abundant number, since it is smaller than the sum of its proper divisors (146625014880).

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

78280666848 is a wasteful number, since it uses less digits than its factorization.

78280666848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802256 (or 2802245 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 63.

The spelling of 78280666848 in words is "seventy-eight billion, two hundred eighty million, six hundred sixty-six thousand, eight hundred forty-eight".