77990615824 has 75 divisors (see below), whose sum is σ = 166505037285. Its totient is φ = 35388840960.

The previous prime is 77990615803. The next prime is 77990615837. The reversal of 77990615824 is 42851609977.

The square root of 77990615824 is 279268.

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

It can be written as a sum of positive squares in only one way, i.e., 77450890000 + 539725824 = 278300^2 + 23232^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 135165424 + ... + 135166000.

Almost surely, 2^77990615824 is an apocalyptic number.

77990615824 is the 279268-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77990615824

77990615824 is an abundant number, since it is smaller than the sum of its proper divisors (88514421461).

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

77990615824 is an frugal number, since it uses more digits than its factorization.

77990615824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206 (or 590 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 77990615824 in words is "seventy-seven billion, nine hundred ninety million, six hundred fifteen thousand, eight hundred twenty-four".