78428631911 has 8 divisors (see below), whose sum is σ = 89635097760. Its totient is φ = 67222759968.

The previous prime is 78428631859. The next prime is 78428631971. The reversal of 78428631911 is 11913682487.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78428631911 - 2¹⁰ = 78428630887 is a prime.

It is a super-2 number, since 2×78428631911² (a number of 23 digits) contains 22 as substring.

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 78428631911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78428631971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184205 + ... + 436793.

It is an arithmetic number, because the mean of its divisors is an integer number (11204387220).

Almost surely, 2^78428631911 is an apocalyptic number.

78428631911 is a deficient number, since it is larger than the sum of its proper divisors (11206465849).

78428631911 is a wasteful number, since it uses less digits than its factorization.

78428631911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296953.

The product of its digits is 580608, while the sum is 50.

The spelling of 78428631911 in words is "seventy-eight billion, four hundred twenty-eight million, six hundred thirty-one thousand, nine hundred eleven".