78809894370 has 48 divisors (see below), whose sum is σ = 205785203832. Its totient is φ = 20925768960.

The previous prime is 78809894369. The next prime is 78809894377. The reversal of 78809894370 is 7349890887.

It can be written as a sum of positive squares in 4 ways, for example, as 28372370481 + 50437523889 = 168441^2 + 224583^2 .

It is a super-2 number, since 2×78809894370² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78809894298 and 78809894307.

It is not an unprimeable number, because it can be changed into a prime (78809894377) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1858141 + ... + 1900080.

Almost surely, 2^78809894370 is an apocalyptic number.

78809894370 is an abundant number, since it is smaller than the sum of its proper divisors (126975309462).

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

78809894370 is a wasteful number, since it uses less digits than its factorization.

78809894370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3758467 (or 3758464 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 78809894370 in words is "seventy-eight billion, eight hundred nine million, eight hundred ninety-four thousand, three hundred seventy".