78148640057884 has 72 divisors (see below), whose sum is σ = 159635160231120. Its totient is φ = 33354714032640.

The previous prime is 78148640057843. The next prime is 78148640057893. The reversal of 78148640057884 is 48875004684187.

It is a happy number.

It is a super-2 number, since 2×78148640057884² (a number of 29 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 (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36563119 + ... + 38641414.

It is an arithmetic number, because the mean of its divisors is an integer number (2217155003210).

Almost surely, 2^{78148640057884} is an apocalyptic number.

It is an amenable number.

78148640057884 is an abundant number, since it is smaller than the sum of its proper divisors (81486520173236).

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

78148640057884 is a wasteful number, since it uses less digits than its factorization.

78148640057884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75204691 (or 75204678 counting only the distinct ones).

The product of its (nonzero) digits is 385351680, while the sum is 70.

The spelling of 78148640057884 in words is "seventy-eight trillion, one hundred forty-eight billion, six hundred forty million, fifty-seven thousand, eight hundred eighty-four".