78396623955 has 240 divisors, whose sum is σ = 163381421280. Its totient is φ = 35736256512.

The previous prime is 78396623953. The next prime is 78396623959. The reversal of 78396623955 is 55932669387.

78396623955 is a `hidden beast` number, since 7 + 8 + 396 + 6 + 239 + 5 + 5 = 666.

It is not a de Polignac number, because 78396623955 - 2¹ = 78396623953 is a prime.

It is a super-2 number, since 2×78396623955² (a number of 23 digits) contains 22 as substring.

Its product of digits (73483200) is a multiple of the sum of its prime factors (900).

It is a junction number, because it is equal to n+sod(n) for n = 78396623892 and 78396623901.

It is not an unprimeable number, because it can be changed into a prime (78396623953) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 101945811 + ... + 101946579.

It is an arithmetic number, because the mean of its divisors is an integer number (680755922).

Almost surely, 2^78396623955 is an apocalyptic number.

78396623955 is an abundant number, since it is smaller than the sum of its proper divisors (84984797325).

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

78396623955 is a wasteful number, since it uses less digits than its factorization.

78396623955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900 (or 874 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 63.

The spelling of 78396623955 in words is "seventy-eight billion, three hundred ninety-six million, six hundred twenty-three thousand, nine hundred fifty-five".