77841864340 has 24 divisors (see below), whose sum is σ = 163856217672. Its totient is φ = 31062783360.

The previous prime is 77841864323. The next prime is 77841864341. The reversal of 77841864340 is 4346814877.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 119115396 + 77722748944 = 10914^2 + 278788^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77841864341) 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, 4614019 + ... + 4630858.

It is an arithmetic number, because the mean of its divisors is an integer number (6827342403).

Almost surely, 2^77841864340 is an apocalyptic number.

It is an amenable number.

77841864340 is an abundant number, since it is smaller than the sum of its proper divisors (86014353332).

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

77841864340 is a wasteful number, since it uses less digits than its factorization.

77841864340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9245307 (or 9245305 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 52.

The spelling of 77841864340 in words is "seventy-seven billion, eight hundred forty-one million, eight hundred sixty-four thousand, three hundred forty".