78817010582 has 4 divisors (see below), whose sum is σ = 118225515876. Its totient is φ = 39408505290.

The previous prime is 78817010561. The next prime is 78817010609. The reversal of 78817010582 is 28501071887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28501071887 = 431 ⋅66127777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19704252644 + ... + 19704252647.

It is an arithmetic number, because the mean of its divisors is an integer number (29556378969).

Almost surely, 2^78817010582 is an apocalyptic number.

78817010582 is a deficient number, since it is larger than the sum of its proper divisors (39408505294).

78817010582 is a wasteful number, since it uses less digits than its factorization.

78817010582 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39408505293.

The product of its (nonzero) digits is 250880, while the sum is 47.

The spelling of 78817010582 in words is "seventy-eight billion, eight hundred seventeen million, ten thousand, five hundred eighty-two".