74065645 has 16 divisors (see below), whose sum is σ = 90972720. Its totient is φ = 57867264.

The previous prime is 74065633. The next prime is 74065657. The reversal of 74065645 is 54656047.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (74065633) and next prime (74065657).

It can be written as a sum of positive squares in 8 ways, for example, as 3992004 + 70073641 = 1998^2 + 8371^2 .

It is a cyclic number.

It is not a de Polignac number, because 74065645 - 2⁷ = 74065517 is a prime.

It is a super-3 number, since 3×74065645³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72901 + ... + 73909.

It is an arithmetic number, because the mean of its divisors is an integer number (5685795).

Almost surely, 2^74065645 is an apocalyptic number.

It is an amenable number.

74065645 is a deficient number, since it is larger than the sum of its proper divisors (16907075).

74065645 is a wasteful number, since it uses less digits than its factorization.

74065645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1344.

The product of its (nonzero) digits is 100800, while the sum is 37.

The square root of 74065645 is about 8606.1399593546. The cubic root of 74065645 is about 419.9577527422.

The spelling of 74065645 in words is "seventy-four million, sixty-five thousand, six hundred forty-five".