78578045019 has 24 divisors (see below), whose sum is σ = 115671106512. Its totient is φ = 51384540480.

The previous prime is 78578044999. The next prime is 78578045027. The reversal of 78578045019 is 91054087587.

78578045019 is a `hidden beast` number, since 7 + 8 + 57 + 80 + 4 + 501 + 9 = 666.

It is not a de Polignac number, because 78578045019 - 2²³ = 78569656411 is a prime.

It is a super-2 number, since 2×78578045019² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78578045719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2220049 + ... + 2255165.

It is an arithmetic number, because the mean of its divisors is an integer number (4819629438).

Almost surely, 2^78578045019 is an apocalyptic number.

78578045019 is a deficient number, since it is larger than the sum of its proper divisors (37093061493).

78578045019 is a wasteful number, since it uses less digits than its factorization.

78578045019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39867 (or 39864 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The spelling of 78578045019 in words is "seventy-eight billion, five hundred seventy-eight million, forty-five thousand, nineteen".