74511643640 has 128 divisors (see below), whose sum is σ = 204186562560. Its totient is φ = 23916102144.

The previous prime is 74511643639. The next prime is 74511643651. The reversal of 74511643640 is 4634611547.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179594 + ... + 425766.

It is an arithmetic number, because the mean of its divisors is an integer number (1595207520).

Almost surely, 2^74511643640 is an apocalyptic number.

74511643640 is a gapful number since it is divisible by the number (70) 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 74511643640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102093281280).

74511643640 is an abundant number, since it is smaller than the sum of its proper divisors (129674918920).

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

74511643640 is a wasteful number, since it uses less digits than its factorization.

74511643640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246261 (or 246257 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 74511643640 in words is "seventy-four billion, five hundred eleven million, six hundred forty-three thousand, six hundred forty".