74747213 has 4 divisors (see below), whose sum is σ = 74917920. Its totient is φ = 74576508.

The previous prime is 74747209. The next prime is 74747221. The reversal of 74747213 is 31274747.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 74747213 - 2² = 74747209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74747243) 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, 84695 + ... + 85572.

It is an arithmetic number, because the mean of its divisors is an integer number (18729480).

Almost surely, 2^74747213 is an apocalyptic number.

It is an amenable number.

74747213 is a deficient number, since it is larger than the sum of its proper divisors (170707).

74747213 is a wasteful number, since it uses less digits than its factorization.

74747213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170706.

The product of its digits is 32928, while the sum is 35.

The square root of 74747213 is about 8645.6470550214. The cubic root of 74747213 is about 421.2420019790.

The spelling of 74747213 in words is "seventy-four million, seven hundred forty-seven thousand, two hundred thirteen".