74634821 has 4 divisors (see below), whose sum is σ = 74659500. Its totient is φ = 74610144.

The previous prime is 74634787. The next prime is 74634853. The reversal of 74634821 is 12843647.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7230721 + 67404100 = 2689^2 + 8210^2 .

It is a cyclic number.

It is not a de Polignac number, because 74634821 - 2⁶ = 74634757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74634871) 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, 7046 + ... + 14103.

It is an arithmetic number, because the mean of its divisors is an integer number (18664875).

Almost surely, 2^74634821 is an apocalyptic number.

It is an amenable number.

74634821 is a deficient number, since it is larger than the sum of its proper divisors (24679).

74634821 is a wasteful number, since it uses less digits than its factorization.

74634821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24678.

The product of its digits is 32256, while the sum is 35.

The square root of 74634821 is about 8639.1446914611. The cubic root of 74634821 is about 421.0307656515.

The spelling of 74634821 in words is "seventy-four million, six hundred thirty-four thousand, eight hundred twenty-one".