78890211653698 has 8 divisors (see below), whose sum is σ = 118336605283260. Its totient is φ = 39444676559280.

The previous prime is 78890211653609. The next prime is 78890211653699. The reversal of 78890211653698 is 89635611209887.

It can be written as a sum of positive squares in 2 ways, for example, as 78023072626489 + 867139027209 = 8833067^2 + 931203^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78890211653698.

It is not an unprimeable number, because it can be changed into a prime (78890211653699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214404013 + ... + 214771648.

Almost surely, 2^{78890211653698} is an apocalyptic number.

78890211653698 is a deficient number, since it is larger than the sum of its proper divisors (39446393629562).

78890211653698 is a wasteful number, since it uses less digits than its factorization.

78890211653698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429267572.

The product of its (nonzero) digits is 313528320, while the sum is 73.

The spelling of 78890211653698 in words is "seventy-eight trillion, eight hundred ninety billion, two hundred eleven million, six hundred fifty-three thousand, six hundred ninety-eight".