78322700861 has 8 divisors (see below), whose sum is σ = 80449460280. Its totient is φ = 76196464128.

The previous prime is 78322700851. The next prime is 78322700893. The reversal of 78322700861 is 16800722387.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 58337223961 + 19985476900 = 241531^2 + 141370^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78322700861 - 2³⁴ = 61142831677 is a prime.

It is a super-2 number, since 2×78322700861² (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 (78322700831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183185 + ... + 436121.

It is an arithmetic number, because the mean of its divisors is an integer number (10056182535).

Almost surely, 2^78322700861 is an apocalyptic number.

It is an amenable number.

78322700861 is a deficient number, since it is larger than the sum of its proper divisors (2126759419).

78322700861 is a wasteful number, since it uses less digits than its factorization.

78322700861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261343.

The product of its (nonzero) digits is 225792, while the sum is 44.

The spelling of 78322700861 in words is "seventy-eight billion, three hundred twenty-two million, seven hundred thousand, eight hundred sixty-one".