77434440471378 has 24 divisors (see below), whose sum is σ = 167777838299916. Its totient is φ = 25810985191200.

The previous prime is 77434440471359. The next prime is 77434440471431. The reversal of 77434440471378 is 87317404443477.

77434440471378 is a `hidden beast` number, since 7 + 74 + 3 + 4 + 440 + 47 + 13 + 78 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 76464583826409 + 969856644969 = 8744403^2 + 984813^2 .

It is a super-2 number, since 2×77434440471378² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40281813 + ... + 42160328.

Almost surely, 2^{77434440471378} is an apocalyptic number.

77434440471378 is an abundant number, since it is smaller than the sum of its proper divisors (90343397828538).

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

77434440471378 is a wasteful number, since it uses less digits than its factorization.

77434440471378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82494330 (or 82494327 counting only the distinct ones).

The product of its (nonzero) digits is 177020928, while the sum is 63.

The spelling of 77434440471378 in words is "seventy-seven trillion, four hundred thirty-four billion, four hundred forty million, four hundred seventy-one thousand, three hundred seventy-eight".