78478911 has 24 divisors (see below), whose sum is σ = 136373120. Its totient is φ = 42484176.

The previous prime is 78478891. The next prime is 78478931. The reversal of 78478911 is 11987487.

It is an interprime number because it is at equal distance from previous prime (78478891) and next prime (78478931).

It is not a de Polignac number, because 78478911 - 2⁶ = 78478847 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78478931) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31585 + ... + 33978.

Almost surely, 2^78478911 is an apocalyptic number.

78478911 is a deficient number, since it is larger than the sum of its proper divisors (57894209).

78478911 is a wasteful number, since it uses less digits than its factorization.

78478911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65595 (or 65592 counting only the distinct ones).

The product of its digits is 112896, while the sum is 45.

The square root of 78478911 is about 8858.8323722712. The cubic root of 78478911 is about 428.1385389435.

The spelling of 78478911 in words is "seventy-eight million, four hundred seventy-eight thousand, nine hundred eleven".