78044993 has 8 divisors (see below), whose sum is σ = 84134568. Its totient is φ = 71967744.

The previous prime is 78044959. The next prime is 78044999. The reversal of 78044993 is 39944087.

It can be written as a sum of positive squares in 4 ways, for example, as 23104 + 78021889 = 152^2 + 8833^2 .

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 78044993 - 2⁸ = 78044737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78044999) 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, 13355 + ... + 18287.

It is an arithmetic number, because the mean of its divisors is an integer number (10516821).

Almost surely, 2^78044993 is an apocalyptic number.

It is an amenable number.

78044993 is a deficient number, since it is larger than the sum of its proper divisors (6089575).

78044993 is a wasteful number, since it uses less digits than its factorization.

78044993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6163.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 78044993 is about 8834.3077261323. The cubic root of 78044993 is about 427.3480061102.

The spelling of 78044993 in words is "seventy-eight million, forty-four thousand, nine hundred ninety-three".