73662221 has 4 divisors (see below), whose sum is σ = 77539200. Its totient is φ = 69785244.

The previous prime is 73662203. The next prime is 73662223. The reversal of 73662221 is 12226637.

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 73662221 - 2⁶ = 73662157 is a prime.

It is a super-2 number, since 2×73662221² = 10852245605305682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73662223) 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, 1938461 + ... + 1938498.

It is an arithmetic number, because the mean of its divisors is an integer number (19384800).

Almost surely, 2^73662221 is an apocalyptic number.

It is an amenable number.

73662221 is a deficient number, since it is larger than the sum of its proper divisors (3876979).

73662221 is a wasteful number, since it uses less digits than its factorization.

73662221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876978.

The product of its digits is 6048, while the sum is 29.

The square root of 73662221 is about 8582.6698060685. The cubic root of 73662221 is about 419.1938827367.

Adding to 73662221 its reverse (12226637), we get a palindrome (85888858).

The spelling of 73662221 in words is "seventy-three million, six hundred sixty-two thousand, two hundred twenty-one".