78766923420 has 96 divisors (see below), whose sum is σ = 245114533440. Its totient is φ = 20999208960.

The previous prime is 78766923419. The next prime is 78766923427. The reversal of 78766923420 is 2432966787.

78766923420 is a `hidden beast` number, since 78 + 7 + 66 + 92 + 3 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78766923427) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 2420860 + ... + 2453180.

It is an arithmetic number, because the mean of its divisors is an integer number (2553276390).

Almost surely, 2^78766923420 is an apocalyptic number.

It is an amenable number.

78766923420 is an abundant number, since it is smaller than the sum of its proper divisors (166347610020).

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

78766923420 is a wasteful number, since it uses less digits than its factorization.

78766923420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36852 (or 36844 counting only the distinct ones).

The product of its (nonzero) digits is 6096384, while the sum is 54.

The spelling of 78766923420 in words is "seventy-eight billion, seven hundred sixty-six million, nine hundred twenty-three thousand, four hundred twenty".