78417876826 has 8 divisors (see below), whose sum is σ = 117643841460. Its totient is φ = 39203263008.

The previous prime is 78417876767. The next prime is 78417876827. The reversal of 78417876826 is 62867871487.

It can be written as a sum of positive squares in 2 ways, for example, as 70987609225 + 7430267601 = 266435^2 + 86199^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78417876826² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78417876827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2820411 + ... + 2848078.

Almost surely, 2^78417876826 is an apocalyptic number.

78417876826 is a deficient number, since it is larger than the sum of its proper divisors (39225964634).

78417876826 is a wasteful number, since it uses less digits than its factorization.

78417876826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5675408.

The product of its digits is 50577408, while the sum is 64.

The spelling of 78417876826 in words is "seventy-eight billion, four hundred seventeen million, eight hundred seventy-six thousand, eight hundred twenty-six".