77358221408 has 72 divisors (see below), whose sum is σ = 168113744064. Its totient is φ = 34832655360.

The previous prime is 77358221393. The next prime is 77358221443. The reversal of 77358221408 is 80412285377.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 643985 + ... + 754607.

It is an arithmetic number, because the mean of its divisors is an integer number (2334913112).

Almost surely, 2^77358221408 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 77358221408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84056872032).

77358221408 is an abundant number, since it is smaller than the sum of its proper divisors (90755522656).

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

77358221408 is a wasteful number, since it uses less digits than its factorization.

77358221408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110728 (or 110679 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 47.

The spelling of 77358221408 in words is "seventy-seven billion, three hundred fifty-eight million, two hundred twenty-one thousand, four hundred eight".