78810897408 has 176 divisors, whose sum is σ = 218332692480. Its totient is φ = 25244319744.

The previous prime is 78810897391. The next prime is 78810897409. The reversal of 78810897408 is 80479801887.

It is a super-2 number, since 2×78810897408² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78810897409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19864641 + ... + 19868607.

Almost surely, 2^78810897408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78810897408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109166346240).

78810897408 is an abundant number, since it is smaller than the sum of its proper divisors (139521795072).

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

78810897408 is a wasteful number, since it uses less digits than its factorization.

78810897408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242 (or 4224 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 60.

The spelling of 78810897408 in words is "seventy-eight billion, eight hundred ten million, eight hundred ninety-seven thousand, four hundred eight".