78898123694 has 32 divisors (see below), whose sum is σ = 135412663680. Its totient is φ = 34175531232.

The previous prime is 78898123691. The next prime is 78898123697. The reversal of 78898123694 is 49632189887.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78898123691) and next prime (78898123697).

It is a self number, because there is not a number n which added to its sum of digits gives 78898123694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78898123691) 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, 693464 + ... + 799179.

It is an arithmetic number, because the mean of its divisors is an integer number (4231645740).

Almost surely, 2^78898123694 is an apocalyptic number.

78898123694 is a deficient number, since it is larger than the sum of its proper divisors (56514539986).

78898123694 is a wasteful number, since it uses less digits than its factorization.

78898123694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1492784.

The product of its digits is 41803776, while the sum is 65.

The spelling of 78898123694 in words is "seventy-eight billion, eight hundred ninety-eight million, one hundred twenty-three thousand, six hundred ninety-four".