74791181520 has 240 divisors, whose sum is σ = 284156937792. Its totient is φ = 18131143680.

The previous prime is 74791181501. The next prime is 74791181527. The reversal of 74791181520 is 2518119747.

It is a happy number.

74791181520 is a `hidden beast` number, since 7 + 4 + 7 + 9 + 118 + 1 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74791181527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38964 + ... + 388716.

Almost surely, 2^74791181520 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 74791181520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142078468896).

74791181520 is an abundant number, since it is smaller than the sum of its proper divisors (209365756272).

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

74791181520 is a wasteful number, since it uses less digits than its factorization.

74791181520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349792 (or 349774 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 74791181520 in words is "seventy-four billion, seven hundred ninety-one million, one hundred eighty-one thousand, five hundred twenty".