78540111 has 20 divisors (see below), whose sum is σ = 126352072. Its totient is φ = 48331728.

The previous prime is 78540107. The next prime is 78540113. The reversal of 78540111 is 11104587.

78540111 is a `hidden beast` number, since 7 + 8 + 540 + 111 = 666.

It is not a de Polignac number, because 78540111 - 2² = 78540107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78540113) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 36241 + ... + 38346.

Almost surely, 2^78540111 is an apocalyptic number.

78540111 is a deficient number, since it is larger than the sum of its proper divisors (47811961).

78540111 is a wasteful number, since it uses less digits than its factorization.

78540111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74612 (or 74603 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 78540111 is about 8862.2858789367. The cubic root of 78540111 is about 428.2498014053.

Adding to 78540111 its reverse (11104587), we get a palindrome (89644698).

The spelling of 78540111 in words is "seventy-eight million, five hundred forty thousand, one hundred eleven".