77426099808 has 96 divisors (see below), whose sum is σ = 208590826752. Its totient is φ = 25138444800.

The previous prime is 77426099801. The next prime is 77426099809. The reversal of 77426099808 is 80899062477.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77426099801) 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, 497298 + ... + 634158.

It is an arithmetic number, because the mean of its divisors is an integer number (2172821112).

Almost surely, 2^77426099808 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 77426099808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104295413376).

77426099808 is an abundant number, since it is smaller than the sum of its proper divisors (131164726944).

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

77426099808 is a wasteful number, since it uses less digits than its factorization.

77426099808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137028 (or 137020 counting only the distinct ones).

The product of its (nonzero) digits is 12192768, while the sum is 60.

The spelling of 77426099808 in words is "seventy-seven billion, four hundred twenty-six million, ninety-nine thousand, eight hundred eight".