78691237311 has 32 divisors (see below), whose sum is σ = 113192916480. Its totient is φ = 48463833600.

The previous prime is 78691237309. The next prime is 78691237319. The reversal of 78691237311 is 11373219687.

It is not a de Polignac number, because 78691237311 - 2¹ = 78691237309 is a prime.

It is a super-2 number, since 2×78691237311² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78691237319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5585406 + ... + 5599476.

It is an arithmetic number, because the mean of its divisors is an integer number (3537278640).

Almost surely, 2^78691237311 is an apocalyptic number.

78691237311 is a deficient number, since it is larger than the sum of its proper divisors (34501679169).

78691237311 is a wasteful number, since it uses less digits than its factorization.

78691237311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16527.

The product of its digits is 381024, while the sum is 48.

The spelling of 78691237311 in words is "seventy-eight billion, six hundred ninety-one million, two hundred thirty-seven thousand, three hundred eleven".