78709081 has 8 divisors (see below), whose sum is σ = 87485184. Its totient is φ = 70203120.

The previous prime is 78709061. The next prime is 78709091. The reversal of 78709081 is 18090787.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78709081 is a prime.

It is a super-2 number, since 2×78709081² = 12390238863729122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78709021) 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, 66921 + ... + 68086.

It is an arithmetic number, because the mean of its divisors is an integer number (10935648).

Almost surely, 2^78709081 is an apocalyptic number.

It is an amenable number.

78709081 is a deficient number, since it is larger than the sum of its proper divisors (8776103).

78709081 is a wasteful number, since it uses less digits than its factorization.

78709081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135071.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 78709081 is about 8871.8138506170. The cubic root of 78709081 is about 428.5566914668.

The spelling of 78709081 in words is "seventy-eight million, seven hundred nine thousand, eighty-one".