73777717648 has 40 divisors (see below), whose sum is σ = 155044373400. Its totient is φ = 33872117760.

The previous prime is 73777717621. The next prime is 73777717661. The reversal of 73777717648 is 84671777737.

It can be written as a sum of positive squares in 4 ways, for example, as 23156317584 + 50621400064 = 152172^2 + 224992^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 73777717648.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3296673 + ... + 3318976.

It is an arithmetic number, because the mean of its divisors is an integer number (3876109335).

Almost surely, 2^73777717648 is an apocalyptic number.

It is an amenable number.

73777717648 is an abundant number, since it is smaller than the sum of its proper divisors (81266655752).

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

73777717648 is a wasteful number, since it uses less digits than its factorization.

73777717648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6615715 (or 6615709 counting only the distinct ones).

The product of its digits is 67765824, while the sum is 64.

The spelling of 73777717648 in words is "seventy-three billion, seven hundred seventy-seven million, seven hundred seventeen thousand, six hundred forty-eight".