77221702857744 has 45 divisors (see below), whose sum is σ = 216113810753503. Its totient is φ = 25740532468896.

The previous prime is 77221702857727. The next prime is 77221702857779. The reversal of 77221702857744 is 44775820712277.

It is a happy number.

The square root of 77221702857744 is 8787588.

It is a perfect power (a square), and thus also a powerful number.

77221702857744 is a `hidden beast` number, since 7 + 7 + 2 + 2 + 17 + 0 + 2 + 8 + 577 + 44 = 666.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 105084907 + ... + 105817205.

Almost surely, 2^{77221702857744} is an apocalyptic number.

77221702857744 is the 8787588-th square number.

It is an amenable number.

77221702857744 is an abundant number, since it is smaller than the sum of its proper divisors (138892107895759).

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

77221702857744 is an frugal number, since it uses more digits than its factorization.

77221702857744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464612 (or 732304 counting only the distinct ones).

The product of its (nonzero) digits is 86051840, while the sum is 63.

The spelling of 77221702857744 in words is "seventy-seven trillion, two hundred twenty-one billion, seven hundred two million, eight hundred fifty-seven thousand, seven hundred forty-four".