74378165 has 4 divisors (see below), whose sum is σ = 89253804. Its totient is φ = 59502528.

The previous prime is 74378099. The next prime is 74378191. The reversal of 74378165 is 56187347.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56187347 = 97 ⋅579251.

It can be written as a sum of positive squares in 2 ways, for example, as 29528356 + 44849809 = 5434^2 + 6697^2 .

It is a cyclic number.

It is not a de Polignac number, because 74378165 - 2⁸ = 74377909 is a prime.

It is a super-2 number, since 2×74378165² = 11064222857534450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7437812 + ... + 7437821.

It is an arithmetic number, because the mean of its divisors is an integer number (22313451).

Almost surely, 2^74378165 is an apocalyptic number.

It is an amenable number.

74378165 is a deficient number, since it is larger than the sum of its proper divisors (14875639).

74378165 is a wasteful number, since it uses less digits than its factorization.

74378165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14875638.

The product of its digits is 141120, while the sum is 41.

The square root of 74378165 is about 8624.2776509108. The cubic root of 74378165 is about 420.5475945059.

The spelling of 74378165 in words is "seventy-four million, three hundred seventy-eight thousand, one hundred sixty-five".