78613861 has 8 divisors (see below), whose sum is σ = 81252864. Its totient is φ = 75981360.

The previous prime is 78613841. The next prime is 78613877. The reversal of 78613861 is 16831687.

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 78613861 - 2²¹ = 76516709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78613841) 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, 41640 + ... + 43486.

It is an arithmetic number, because the mean of its divisors is an integer number (10156608).

Almost surely, 2^78613861 is an apocalyptic number.

It is an amenable number.

78613861 is a deficient number, since it is larger than the sum of its proper divisors (2639003).

78613861 is a wasteful number, since it uses less digits than its factorization.

78613861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3251.

The product of its digits is 48384, while the sum is 40.

The square root of 78613861 is about 8866.4457929883. The cubic root of 78613861 is about 428.3838031779.

The spelling of 78613861 in words is "seventy-eight million, six hundred thirteen thousand, eight hundred sixty-one".