78180965 has 8 divisors (see below), whose sum is σ = 94053528. Its totient is φ = 62387200.

The previous prime is 78180929. The next prime is 78180997. The reversal of 78180965 is 56908187.

It is a happy number.

It is a Cunningham number, because it is equal to 8842²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 20921476 + 57259489 = 4574^2 + 7567^2 .

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

It is not a de Polignac number, because 78180965 - 2⁸ = 78180709 is a prime.

It is a super-2 number, since 2×78180965² = 12224526576662450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17492 + ... + 21501.

It is an arithmetic number, because the mean of its divisors is an integer number (11756691).

Almost surely, 2^78180965 is an apocalyptic number.

It is an amenable number.

78180965 is a deficient number, since it is larger than the sum of its proper divisors (15872563).

78180965 is a wasteful number, since it uses less digits than its factorization.

78180965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39399.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 78180965 is about 8842.0000565483. Note that the first 4 decimals coincide. The cubic root of 78180965 is about 427.5960410282.

The spelling of 78180965 in words is "seventy-eight million, one hundred eighty thousand, nine hundred sixty-five".