78322861 has 4 divisors (see below), whose sum is σ = 78344892. Its totient is φ = 78300832.

The previous prime is 78322813. The next prime is 78322873. The reversal of 78322861 is 16822387.

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 54848836 + 23474025 = 7406^2 + 4845^2 .

It is a cyclic number.

It is not a de Polignac number, because 78322861 - 2¹³ = 78314669 is a prime.

It is a super-2 number, since 2×78322861² = 12268941110450642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78322861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78322801) 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, 4330 + ... + 13243.

It is an arithmetic number, because the mean of its divisors is an integer number (19586223).

Almost surely, 2^78322861 is an apocalyptic number.

It is an amenable number.

78322861 is a deficient number, since it is larger than the sum of its proper divisors (22031).

78322861 is a wasteful number, since it uses less digits than its factorization.

78322861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22030.

The product of its digits is 32256, while the sum is 37.

The square root of 78322861 is about 8850.0203954567. The cubic root of 78322861 is about 427.8545758159.

The spelling of 78322861 in words is "seventy-eight million, three hundred twenty-two thousand, eight hundred sixty-one".