78945381 has 8 divisors (see below), whose sum is σ = 116956160. Its totient is φ = 52630236.

The previous prime is 78945353. The next prime is 78945389. The reversal of 78945381 is 18354987.

It is not a de Polignac number, because 78945381 - 2¹⁰ = 78944357 is a prime.

It is a super-2 number, since 2×78945381² = 12464746362470322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78945389) 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, 1461925 + ... + 1461978.

It is an arithmetic number, because the mean of its divisors is an integer number (14619520).

Almost surely, 2^78945381 is an apocalyptic number.

It is an amenable number.

78945381 is a deficient number, since it is larger than the sum of its proper divisors (38010779).

78945381 is a wasteful number, since it uses less digits than its factorization.

78945381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923912 (or 2923906 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 78945381 is about 8885.1213272527. The cubic root of 78945381 is about 428.9851332322.

The spelling of 78945381 in words is "seventy-eight million, nine hundred forty-five thousand, three hundred eighty-one".