78720477875 has 64 divisors (see below), whose sum is σ = 107597258496. Its totient is φ = 57149568000.

The previous prime is 78720477853. The next prime is 78720477877. The reversal of 78720477875 is 57877402787.

It is not a de Polignac number, because 78720477875 - 2¹⁶ = 78720412339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78720477877) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 52725629 + ... + 52727121.

It is an arithmetic number, because the mean of its divisors is an integer number (1681207164).

Almost surely, 2^78720477875 is an apocalyptic number.

78720477875 is a deficient number, since it is larger than the sum of its proper divisors (28876780621).

78720477875 is a wasteful number, since it uses less digits than its factorization.

78720477875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2049 (or 2039 counting only the distinct ones).

The product of its (nonzero) digits is 43025920, while the sum is 62.

The spelling of 78720477875 in words is "seventy-eight billion, seven hundred twenty million, four hundred seventy-seven thousand, eight hundred seventy-five".