78812323501 has 4 divisors (see below), whose sum is σ = 78818184892. Its totient is φ = 78806462112.

The previous prime is 78812323453. The next prime is 78812323511. The reversal of 78812323501 is 10532321887.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55227350025 + 23584973476 = 235005^2 + 153574^2 .

It is a cyclic number.

It is not a de Polignac number, because 78812323501 - 2²⁹ = 78275452589 is a prime.

It is a super-2 number, since 2×78812323501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78812323511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2910480 + ... + 2937433.

It is an arithmetic number, because the mean of its divisors is an integer number (19704546223).

Almost surely, 2^78812323501 is an apocalyptic number.

It is an amenable number.

78812323501 is a deficient number, since it is larger than the sum of its proper divisors (5861391).

78812323501 is a wasteful number, since it uses less digits than its factorization.

78812323501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5861390.

The product of its (nonzero) digits is 80640, while the sum is 40.

It can be divided in two parts, 7881 and 2323501, that multiplied together give a palindrome (18311511381).

The spelling of 78812323501 in words is "seventy-eight billion, eight hundred twelve million, three hundred twenty-three thousand, five hundred one".