74691640512 has 112 divisors (see below), whose sum is σ = 219786403200. Its totient is φ = 24873765120.

The previous prime is 74691640511. The next prime is 74691640537. The reversal of 74691640512 is 21504619647.

74691640512 is a `hidden beast` number, since 7 + 4 + 6 + 91 + 6 + 40 + 512 = 666.

It is not an unprimeable number, because it can be changed into a prime (74691640511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1865439 + ... + 1905057.

It is an arithmetic number, because the mean of its divisors is an integer number (1962378600).

Almost surely, 2^74691640512 is an apocalyptic number.

74691640512 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74691640512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109893201600).

74691640512 is an abundant number, since it is smaller than the sum of its proper divisors (145094762688).

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

74691640512 is a wasteful number, since it uses less digits than its factorization.

74691640512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40731 (or 40715 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 74691640512 in words is "seventy-four billion, six hundred ninety-one million, six hundred forty thousand, five hundred twelve".