78080817 has 8 divisors (see below), whose sum is σ = 104296896. Its totient is φ = 51959312.

The previous prime is 78080809. The next prime is 78080831. The reversal of 78080817 is 71808087.

It is a happy number.

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 78080817 - 2³ = 78080809 is a prime.

It is a super-2 number, since 2×78080817² = 12193227966774978, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78080897) 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, 21693 + ... + 25034.

It is an arithmetic number, because the mean of its divisors is an integer number (13037112).

Almost surely, 2^78080817 is an apocalyptic number.

It is an amenable number.

78080817 is a deficient number, since it is larger than the sum of its proper divisors (26216079).

78080817 is a wasteful number, since it uses less digits than its factorization.

78080817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47287.

The product of its (nonzero) digits is 25088, while the sum is 39.

The square root of 78080817 is about 8836.3350434442. The cubic root of 78080817 is about 427.4133828139.

The spelling of 78080817 in words is "seventy-eight million, eighty thousand, eight hundred seventeen".