78628177719 has 96 divisors (see below), whose sum is σ = 144028160640. Its totient is φ = 40232484864.

The previous prime is 78628177711. The next prime is 78628177721. The reversal of 78628177719 is 91777182687.

It is not a de Polignac number, because 78628177719 - 2³ = 78628177711 is a prime.

It is a super-2 number, since 2×78628177719² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78628177711) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 3853047 + ... + 3873399.

It is an arithmetic number, because the mean of its divisors is an integer number (1500293340).

Almost surely, 2^78628177719 is an apocalyptic number.

78628177719 is a deficient number, since it is larger than the sum of its proper divisors (65399982921).

78628177719 is a wasteful number, since it uses less digits than its factorization.

78628177719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20521 (or 20518 counting only the distinct ones).

The product of its digits is 16595712, while the sum is 63.

The spelling of 78628177719 in words is "seventy-eight billion, six hundred twenty-eight million, one hundred seventy-seven thousand, seven hundred nineteen".