78280215447999 has 64 divisors (see below), whose sum is σ = 109527953190912. Its totient is φ = 49698963072000.

The previous prime is 78280215447991. The next prime is 78280215448021. The reversal of 78280215447999 is 99974451208287.

It is not a de Polignac number, because 78280215447999 - 2³ = 78280215447991 is a prime.

It is a super-2 number, since 2×78280215447999² (a number of 29 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 78280215447999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78280215447991) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 169424754 + ... + 169886160.

It is an arithmetic number, because the mean of its divisors is an integer number (1711374268608).

Almost surely, 2^{78280215447999} is an apocalyptic number.

78280215447999 is a deficient number, since it is larger than the sum of its proper divisors (31247737742913).

78280215447999 is a wasteful number, since it uses less digits than its factorization.

78280215447999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461776.

The product of its (nonzero) digits is 731566080, while the sum is 75.

The spelling of 78280215447999 in words is "seventy-eight trillion, two hundred eighty billion, two hundred fifteen million, four hundred forty-seven thousand, nine hundred ninety-nine".