78420656923 has 16 divisors (see below), whose sum is σ = 95313659904. Its totient is φ = 62985006720.

The previous prime is 78420656911. The next prime is 78420656927. The reversal of 78420656923 is 32965602487.

It is a cyclic number.

It is not a de Polignac number, because 78420656923 - 2²⁵ = 78387102491 is a prime.

It is a super-2 number, since 2×78420656923² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78420656927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1424523 + ... + 1478548.

It is an arithmetic number, because the mean of its divisors is an integer number (5957103744).

Almost surely, 2^78420656923 is an apocalyptic number.

78420656923 is a deficient number, since it is larger than the sum of its proper divisors (16893002981).

78420656923 is a wasteful number, since it uses less digits than its factorization.

78420656923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2903322.

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 78420656923 in words is "seventy-eight billion, four hundred twenty million, six hundred fifty-six thousand, nine hundred twenty-three".