78286081 has 8 divisors (see below), whose sum is σ = 79284744. Its totient is φ = 77291520.

The previous prime is 78286079. The next prime is 78286127. The reversal of 78286081 is 18068287.

It can be written as a sum of positive squares in 4 ways, for example, as 4601025 + 73685056 = 2145^2 + 8584^2 .

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 78286081 - 2¹ = 78286079 is a prime.

It is a super-2 number, since 2×78286081² = 12257420956677122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78286001) 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, 56841 + ... + 58201.

It is an arithmetic number, because the mean of its divisors is an integer number (9910593).

Almost surely, 2^78286081 is an apocalyptic number.

It is an amenable number.

78286081 is a deficient number, since it is larger than the sum of its proper divisors (998663).

78286081 is a wasteful number, since it uses less digits than its factorization.

78286081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 78286081 is about 8847.9421901366. The cubic root of 78286081 is about 427.7875925835.

The spelling of 78286081 in words is "seventy-eight million, two hundred eighty-six thousand, eighty-one".