78142449012 has 12 divisors (see below), whose sum is σ = 182332381056. Its totient is φ = 26047483000.

The previous prime is 78142449001. The next prime is 78142449023. The reversal of 78142449012 is 21094424187.

It is an interprime number because it is at equal distance from previous prime (78142449001) and next prime (78142449023).

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78142449012² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 3255935364 + ... + 3255935387.

It is an arithmetic number, because the mean of its divisors is an integer number (15194365088).

Almost surely, 2^78142449012 is an apocalyptic number.

It is an amenable number.

78142449012 is an abundant number, since it is smaller than the sum of its proper divisors (104189932044).

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

78142449012 is a wasteful number, since it uses less digits than its factorization.

78142449012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6511870758 (or 6511870756 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The spelling of 78142449012 in words is "seventy-eight billion, one hundred forty-two million, four hundred forty-nine thousand, twelve".