78019620345 has 12 divisors (see below), whose sum is σ = 135234008676. Its totient is φ = 41610464160.

The previous prime is 78019620331. The next prime is 78019620347. The reversal of 78019620345 is 54302691087.

78019620345 is a `hidden beast` number, since 7 + 8 + 0 + 19 + 620 + 3 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 52135958889 + 25883661456 = 228333^2 + 160884^2 .

It is not a de Polignac number, because 78019620345 - 2¹¹ = 78019618297 is a prime.

It is a super-2 number, since 2×78019620345² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1733769341 = 78019620345 / (7 + 8 + 0 + 1 + 9 + 6 + 2 + 0 + 3 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 78019620345.

It is not an unprimeable number, because it can be changed into a prime (78019620347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 866884626 + ... + 866884715.

It is an arithmetic number, because the mean of its divisors is an integer number (11269500723).

It is a 1-persistent number, because it is pandigital, but 2⋅78019620345 = 156039240690 is not.

Almost surely, 2^78019620345 is an apocalyptic number.

It is an amenable number.

78019620345 is a deficient number, since it is larger than the sum of its proper divisors (57214388331).

78019620345 is a wasteful number, since it uses less digits than its factorization.

78019620345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1733769352 (or 1733769349 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 78019620345 in words is "seventy-eight billion, nineteen million, six hundred twenty thousand, three hundred forty-five".