74400645 has 16 divisors (see below), whose sum is σ = 129863232. Its totient is φ = 36072960.

The previous prime is 74400643. The next prime is 74400679. The reversal of 74400645 is 54600447.

It is not a de Polignac number, because 74400645 - 2¹ = 74400643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74400643) 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 15 ways as a sum of consecutive naturals, for example, 225292 + ... + 225621.

It is an arithmetic number, because the mean of its divisors is an integer number (8116452).

Almost surely, 2^74400645 is an apocalyptic number.

It is an amenable number.

74400645 is a deficient number, since it is larger than the sum of its proper divisors (55462587).

74400645 is a wasteful number, since it uses less digits than its factorization.

74400645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450932.

The product of its (nonzero) digits is 13440, while the sum is 30.

The square root of 74400645 is about 8625.5808500066. The cubic root of 74400645 is about 420.5899588998.

The spelling of 74400645 in words is "seventy-four million, four hundred thousand, six hundred forty-five".