77640035782 has 16 divisors (see below), whose sum is σ = 118737836640. Its totient is φ = 38066905152.

The previous prime is 77640035779. The next prime is 77640035783. The reversal of 77640035782 is 28753004677.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77640035783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1511682 + ... + 1562197.

It is an arithmetic number, because the mean of its divisors is an integer number (7421114790).

Almost surely, 2^77640035782 is an apocalyptic number.

77640035782 is a deficient number, since it is larger than the sum of its proper divisors (41097800858).

77640035782 is a wasteful number, since it uses less digits than its factorization.

77640035782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3074127.

The product of its (nonzero) digits is 1975680, while the sum is 49.

The spelling of 77640035782 in words is "seventy-seven billion, six hundred forty million, thirty-five thousand, seven hundred eighty-two".