78540011 has 24 divisors (see below), whose sum is σ = 90608112. Its totient is φ = 67953600.

The previous prime is 78539959. The next prime is 78540031. The reversal of 78540011 is 11004587.

It is not a de Polignac number, because 78540011 - 2⁶ = 78539947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78540031) 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, 237116 + ... + 237446.

It is an arithmetic number, because the mean of its divisors is an integer number (3775338).

Almost surely, 2^78540011 is an apocalyptic number.

78540011 is a deficient number, since it is larger than the sum of its proper divisors (12068101).

78540011 is a wasteful number, since it uses less digits than its factorization.

78540011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 78540011 is about 8862.2802370496. The cubic root of 78540011 is about 428.2496196510.

Adding to 78540011 its reverse (11004587), we get a palindrome (89544598).

The spelling of 78540011 in words is "seventy-eight million, five hundred forty thousand, eleven".