78629681 has 8 divisors (see below), whose sum is σ = 84747264. Its totient is φ = 72522000.

The previous prime is 78629651. The next prime is 78629693. The reversal of 78629681 is 18692687.

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 78629681 - 2¹⁸ = 78367537 is a prime.

It is a super-2 number, since 2×78629681² = 12365253468323522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78629651) 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, 27920 + ... + 30606.

It is an arithmetic number, because the mean of its divisors is an integer number (10593408).

Almost surely, 2^78629681 is an apocalyptic number.

It is an amenable number.

78629681 is a deficient number, since it is larger than the sum of its proper divisors (6117583).

78629681 is a wasteful number, since it uses less digits than its factorization.

78629681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4951.

The product of its digits is 290304, while the sum is 47.

The square root of 78629681 is about 8867.3378755972. The cubic root of 78629681 is about 428.4125367758.

The spelling of 78629681 in words is "seventy-eight million, six hundred twenty-nine thousand, six hundred eighty-one".