74644748640 has 384 divisors, whose sum is σ = 325723991040. Its totient is φ = 15510528000.

The previous prime is 74644748623. The next prime is 74644748653. The reversal of 74644748640 is 4684744647.

74644748640 is a `hidden beast` number, since 74 + 64 + 474 + 8 + 6 + 40 = 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 polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 220440 + ... + 444840.

It is an arithmetic number, because the mean of its divisors is an integer number (848239560).

Almost surely, 2^74644748640 is an apocalyptic number.

74644748640 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 74644748640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162861995520).

74644748640 is an abundant number, since it is smaller than the sum of its proper divisors (251079242400).

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

74644748640 is a wasteful number, since it uses less digits than its factorization.

74644748640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224443 (or 224429 counting only the distinct ones).

The product of its (nonzero) digits is 14450688, while the sum is 54.

The spelling of 74644748640 in words is "seventy-four billion, six hundred forty-four million, seven hundred forty-eight thousand, six hundred forty".