74781680 has 20 divisors (see below), whose sum is σ = 173867592. Its totient is φ = 29912640.

The previous prime is 74781677. The next prime is 74781689. The reversal of 74781680 is 8618747.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74781689) 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 3 ways as a sum of consecutive naturals, for example, 467306 + ... + 467465.

Almost surely, 2^74781680 is an apocalyptic number.

It is an amenable number.

74781680 is an abundant number, since it is smaller than the sum of its proper divisors (99085912).

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

74781680 is a wasteful number, since it uses less digits than its factorization.

74781680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934784 (or 934778 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 41.

The square root of 74781680 is about 8647.6401405239. The cubic root of 74781680 is about 421.3067389168.

The spelling of 74781680 in words is "seventy-four million, seven hundred eighty-one thousand, six hundred eighty".