78144519940 has 12 divisors (see below), whose sum is σ = 164103491916. Its totient is φ = 31257807968.

The previous prime is 78144519923. The next prime is 78144520001. The reversal of 78144519940 is 4991544187.

It can be written as a sum of positive squares in 2 ways, for example, as 60832276164 + 17312243776 = 246642^2 + 131576^2 .

It is a super-2 number, since 2×78144519940² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1953612979 + ... + 1953613018.

It is an arithmetic number, because the mean of its divisors is an integer number (13675290993).

Almost surely, 2^78144519940 is an apocalyptic number.

It is an amenable number.

78144519940 is an abundant number, since it is smaller than the sum of its proper divisors (85958971976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78144519940 is a wasteful number, since it uses less digits than its factorization.

78144519940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3907226006 (or 3907226004 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 78144519940 in words is "seventy-eight billion, one hundred forty-four million, five hundred nineteen thousand, nine hundred forty".