78072861 has 8 divisors (see below), whose sum is σ = 104166400. Its totient is φ = 52013952.

The previous prime is 78072859. The next prime is 78072887. The reversal of 78072861 is 16827087.

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

It is not a de Polignac number, because 78072861 - 2¹ = 78072859 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78072811) by changing a digit.

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, 2836 + ... + 12813.

It is an arithmetic number, because the mean of its divisors is an integer number (13020800).

Almost surely, 2^78072861 is an apocalyptic number.

It is an amenable number.

78072861 is a deficient number, since it is larger than the sum of its proper divisors (26093539).

78072861 is a wasteful number, since it uses less digits than its factorization.

78072861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17315.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 78072861 is about 8835.8848453338. The cubic root of 78072861 is about 427.3988653071.

The spelling of 78072861 in words is "seventy-eight million, seventy-two thousand, eight hundred sixty-one".