78809081 has 8 divisors (see below), whose sum is σ = 85895040. Its totient is φ = 71869392.

The previous prime is 78809051. The next prime is 78809123. The reversal of 78809081 is 18090887.

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 78809081 - 2¹⁰ = 78808057 is a prime.

It is a super-2 number, since 2×78809081² = 12421742496129122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78809021) 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, 35441 + ... + 37598.

It is an arithmetic number, because the mean of its divisors is an integer number (10736880).

Almost surely, 2^78809081 is an apocalyptic number.

It is an amenable number.

78809081 is a deficient number, since it is larger than the sum of its proper divisors (7085959).

78809081 is a wasteful number, since it uses less digits than its factorization.

78809081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73135.

The product of its (nonzero) digits is 32256, while the sum is 41.

The square root of 78809081 is about 8877.4478877659. The cubic root of 78809081 is about 428.7381086214.

It can be divided in two parts, 7880 and 9081, that added together give a palindrome (16961).

The spelling of 78809081 in words is "seventy-eight million, eight hundred nine thousand, eighty-one".