78394603698 has 24 divisors (see below), whose sum is σ = 173059787628. Its totient is φ = 25638486432.

The previous prime is 78394603697. The next prime is 78394603739. The reversal of 78394603698 is 89630649387.

78394603698 is a `hidden beast` number, since 7 + 83 + 9 + 460 + 3 + 6 + 98 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 78140934369 + 253669329 = 279537^2 + 15927^2 .

It is a super-2 number, since 2×78394603698² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78394603691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41086365 + ... + 41088272.

Almost surely, 2^78394603698 is an apocalyptic number.

78394603698 is an abundant number, since it is smaller than the sum of its proper divisors (94665183930).

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

78394603698 is a wasteful number, since it uses less digits than its factorization.

78394603698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82174698 (or 82174695 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 63.

The spelling of 78394603698 in words is "seventy-eight billion, three hundred ninety-four million, six hundred three thousand, six hundred ninety-eight".