74645378208 has 72 divisors (see below), whose sum is σ = 212308151328. Its totient is φ = 24877648512.

The previous prime is 74645378207. The next prime is 74645378263. The reversal of 74645378208 is 80287354647.

74645378208 is a `hidden beast` number, since 7 + 4 + 64 + 5 + 378 + 208 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×74645378208² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (74645378207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2057635 + ... + 2093597.

It is an arithmetic number, because the mean of its divisors is an integer number (2948724324).

Almost surely, 2^74645378208 is an apocalyptic number.

It is an amenable number.

74645378208 is an abundant number, since it is smaller than the sum of its proper divisors (137662773120).

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

74645378208 is a wasteful number, since it uses less digits than its factorization.

74645378208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43186 (or 43175 counting only the distinct ones).

The product of its (nonzero) digits is 9031680, while the sum is 54.

The spelling of 74645378208 in words is "seventy-four billion, six hundred forty-five million, three hundred seventy-eight thousand, two hundred eight".