74771639136 has 480 divisors, whose sum is σ = 241606411200. Its totient is φ = 22608875520.

The previous prime is 74771639093. The next prime is 74771639149. The reversal of 74771639136 is 63193617747.

74771639136 is a `hidden beast` number, since 7 + 477 + 1 + 6 + 39 + 136 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

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 79 ways as a sum of consecutive naturals, for example, 105460350 + ... + 105461058.

It is an arithmetic number, because the mean of its divisors is an integer number (503346690).

Almost surely, 2^74771639136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74771639136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120803205600).

74771639136 is an abundant number, since it is smaller than the sum of its proper divisors (166834772064).

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

74771639136 is a wasteful number, since it uses less digits than its factorization.

74771639136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844 (or 827 counting only the distinct ones).

The product of its digits is 4000752, while the sum is 54.

The spelling of 74771639136 in words is "seventy-four billion, seven hundred seventy-one million, six hundred thirty-nine thousand, one hundred thirty-six".