78209312046 has 16 divisors (see below), whose sum is σ = 156421839744. Its totient is φ = 26069234744.

The previous prime is 78209312021. The next prime is 78209312057. The reversal of 78209312046 is 64021390287.

It is a super-2 number, since 2×78209312046² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78209311989 and 78209312007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281125 + ... + 485231.

It is an arithmetic number, because the mean of its divisors is an integer number (9776364984).

Almost surely, 2^78209312046 is an apocalyptic number.

78209312046 is an abundant number, since it is smaller than the sum of its proper divisors (78212527698).

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

78209312046 is a wasteful number, since it uses less digits than its factorization.

78209312046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267975.

The product of its (nonzero) digits is 145152, while the sum is 42.

The spelling of 78209312046 in words is "seventy-eight billion, two hundred nine million, three hundred twelve thousand, forty-six".