78216763157438 has 32 divisors (see below), whose sum is σ = 119512649318400. Its totient is φ = 38384890151616.

The previous prime is 78216763157417. The next prime is 78216763157443. The reversal of 78216763157438 is 83475136761287.

It is a super-2 number, since 2×78216763157438² (a number of 29 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (68) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23548595 + ... + 26664017.

It is an arithmetic number, because the mean of its divisors is an integer number (3734770291200).

Almost surely, 2^{78216763157438} is an apocalyptic number.

78216763157438 is a deficient number, since it is larger than the sum of its proper divisors (41295886160962).

78216763157438 is a wasteful number, since it uses less digits than its factorization.

78216763157438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3116336.

The product of its digits is 284497920, while the sum is 68.

The spelling of 78216763157438 in words is "seventy-eight trillion, two hundred sixteen billion, seven hundred sixty-three million, one hundred fifty-seven thousand, four hundred thirty-eight".