78728542511 has 4 divisors (see below), whose sum is σ = 78859539024. Its totient is φ = 78597546000.

The previous prime is 78728542499. The next prime is 78728542513. The reversal of 78728542511 is 11524582787.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78728542511 - 2⁶ = 78728542447 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78728542511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78728542513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65497355 + ... + 65498556.

It is an arithmetic number, because the mean of its divisors is an integer number (19714884756).

Almost surely, 2^78728542511 is an apocalyptic number.

78728542511 is a deficient number, since it is larger than the sum of its proper divisors (130996513).

78728542511 is a wasteful number, since it uses less digits than its factorization.

78728542511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130996512.

The product of its digits is 1254400, while the sum is 50.

The spelling of 78728542511 in words is "seventy-eight billion, seven hundred twenty-eight million, five hundred forty-two thousand, five hundred eleven".