77646723330 has 128 divisors (see below), whose sum is σ = 209112523776. Its totient is φ = 18286214400.

The previous prime is 77646723311. The next prime is 77646723347. The reversal of 77646723330 is 3332764677.

It is a self number, because there is not a number n which added to its sum of digits gives 77646723330.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8432509 + ... + 8441711.

It is an arithmetic number, because the mean of its divisors is an integer number (1633691592).

Almost surely, 2^77646723330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77646723330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104556261888).

77646723330 is an abundant number, since it is smaller than the sum of its proper divisors (131465800446).

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

77646723330 is a wasteful number, since it uses less digits than its factorization.

77646723330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9952.

The product of its (nonzero) digits is 2667168, while the sum is 48.

The spelling of 77646723330 in words is "seventy-seven billion, six hundred forty-six million, seven hundred twenty-three thousand, three hundred thirty".