74630021 has 4 divisors (see below), whose sum is σ = 77203500. Its totient is φ = 72056544.

The previous prime is 74629993. The next prime is 74630029. The reversal of 74630021 is 12003647.

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 33477796 + 41152225 = 5786^2 + 6415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74630021 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 (74630029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1286696 + ... + 1286753.

It is an arithmetic number, because the mean of its divisors is an integer number (19300875).

Almost surely, 2^74630021 is an apocalyptic number.

It is an amenable number.

74630021 is a deficient number, since it is larger than the sum of its proper divisors (2573479).

74630021 is a wasteful number, since it uses less digits than its factorization.

74630021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573478.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 74630021 is about 8638.8668817154. The cubic root of 74630021 is about 421.0217395206.

Adding to 74630021 its reverse (12003647), we get a palindrome (86633668).

The spelling of 74630021 in words is "seventy-four million, six hundred thirty thousand, twenty-one".