74728720 has 40 divisors (see below), whose sum is σ = 189541440. Its totient is φ = 27173760.

The previous prime is 74728673. The next prime is 74728723. The reversal of 74728720 is 2782747.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 74728720.

It is not an unprimeable number, because it can be changed into a prime (74728723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41580 + ... + 43339.

It is an arithmetic number, because the mean of its divisors is an integer number (4738536).

Almost surely, 2^74728720 is an apocalyptic number.

It is an amenable number.

74728720 is an abundant number, since it is smaller than the sum of its proper divisors (114812720).

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

74728720 is a wasteful number, since it uses less digits than its factorization.

74728720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84943 (or 84937 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 37.

The square root of 74728720 is about 8644.5774911212. The cubic root of 74728720 is about 421.2072596765.

The spelling of 74728720 in words is "seventy-four million, seven hundred twenty-eight thousand, seven hundred twenty".