78621361 has 16 divisors (see below), whose sum is σ = 97398784. Its totient is φ = 61798464.

The previous prime is 78621331. The next prime is 78621371. The reversal of 78621361 is 16312687.

It is not a de Polignac number, because 78621361 - 2⁹ = 78620849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78621331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11536 + ... + 17038.

It is an arithmetic number, because the mean of its divisors is an integer number (6087424).

Almost surely, 2^78621361 is an apocalyptic number.

It is an amenable number.

78621361 is a deficient number, since it is larger than the sum of its proper divisors (18777423).

78621361 is a wasteful number, since it uses less digits than its factorization.

78621361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5680.

The product of its digits is 12096, while the sum is 34.

The square root of 78621361 is about 8866.8687257679. The cubic root of 78621361 is about 428.3974257813.

The spelling of 78621361 in words is "seventy-eight million, six hundred twenty-one thousand, three hundred sixty-one".