78364081 has 4 divisors (see below), whose sum is σ = 78492532. Its totient is φ = 78235632.

The previous prime is 78364073. The next prime is 78364093. The reversal of 78364081 is 18046387.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18046387 = 1657 ⋅10891.

It can be written as a sum of positive squares in 2 ways, for example, as 7535025 + 70829056 = 2745^2 + 8416^2 .

It is a cyclic number.

It is not a de Polignac number, because 78364081 - 2³ = 78364073 is a prime.

It is a super-2 number, since 2×78364081² = 12281858381949122, 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 78364081.

It is not an unprimeable number, because it can be changed into a prime (78364021) 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, 63306 + ... + 64531.

It is an arithmetic number, because the mean of its divisors is an integer number (19623133).

Almost surely, 2^78364081 is an apocalyptic number.

It is an amenable number.

78364081 is a deficient number, since it is larger than the sum of its proper divisors (128451).

78364081 is a wasteful number, since it uses less digits than its factorization.

78364081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128450.

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

The square root of 78364081 is about 8852.3488973266. The cubic root of 78364081 is about 427.9296202003.

The spelling of 78364081 in words is "seventy-eight million, three hundred sixty-four thousand, eighty-one".