78423909975 has 72 divisors (see below), whose sum is σ = 149075271072. Its totient is φ = 39273984000.

The previous prime is 78423909913. The next prime is 78423909983. The reversal of 78423909975 is 57990932487.

It is not a de Polignac number, because 78423909975 - 2⁶ = 78423909911 is a prime.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 1632550 + ... + 1679900.

It is an arithmetic number, because the mean of its divisors is an integer number (2070489876).

Almost surely, 2^78423909975 is an apocalyptic number.

78423909975 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78423909975 is a deficient number, since it is larger than the sum of its proper divisors (70651361097).

78423909975 is a wasteful number, since it uses less digits than its factorization.

78423909975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47817 (or 47809 counting only the distinct ones).

The product of its (nonzero) digits is 34292160, while the sum is 63.

The spelling of 78423909975 in words is "seventy-eight billion, four hundred twenty-three million, nine hundred nine thousand, nine hundred seventy-five".