97788782658 has 96 divisors (see below), whose sum is σ = 232379642880. Its totient is φ = 27347150880.

The previous prime is 97788782657. The next prime is 97788782677. The reversal of 97788782658 is 85628788779.

It is a self number, because there is not a number n which added to its sum of digits gives 97788782658.

It is not an unprimeable number, because it can be changed into a prime (97788782653) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2884635 + ... + 2918337.

It is an arithmetic number, because the mean of its divisors is an integer number (2420621280).

Almost surely, 2^97788782658 is an apocalyptic number.

97788782658 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 97788782658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116189821440).

97788782658 is an abundant number, since it is smaller than the sum of its proper divisors (134590860222).

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

97788782658 is a wasteful number, since it uses less digits than its factorization.

97788782658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33932 (or 33925 counting only the distinct ones).

The product of its digits is 758661120, while the sum is 75.

The spelling of 97788782658 in words is "ninety-seven billion, seven hundred eighty-eight million, seven hundred eighty-two thousand, six hundred fifty-eight".