77440037408 has 24 divisors (see below), whose sum is σ = 156580618572. Its totient is φ = 37673531136.

The previous prime is 77440037383. The next prime is 77440037419. The reversal of 77440037408 is 80473004477.

It can be written as a sum of positive squares in 2 ways, for example, as 76935226384 + 504811024 = 277372^2 + 22468^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32701535 + ... + 32703902.

Almost surely, 2^77440037408 is an apocalyptic number.

It is an amenable number.

77440037408 is an abundant number, since it is smaller than the sum of its proper divisors (79140581164).

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

77440037408 is a wasteful number, since it uses less digits than its factorization.

77440037408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65405484 (or 65405476 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 44.

The spelling of 77440037408 in words is "seventy-seven billion, four hundred forty million, thirty-seven thousand, four hundred eight".