74855221 has 4 divisors (see below), whose sum is σ = 85548832. Its totient is φ = 64161612.

The previous prime is 74855219. The next prime is 74855227. The reversal of 74855221 is 12255847.

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 74855221 - 2¹ = 74855219 is a prime.

It is a super-2 number, since 2×74855221² = 11206608221917682, 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 (74855227) 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, 5346795 + ... + 5346808.

It is an arithmetic number, because the mean of its divisors is an integer number (21387208).

Almost surely, 2^74855221 is an apocalyptic number.

It is an amenable number.

74855221 is a deficient number, since it is larger than the sum of its proper divisors (10693611).

74855221 is a wasteful number, since it uses less digits than its factorization.

74855221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10693610.

The product of its digits is 22400, while the sum is 34.

The square root of 74855221 is about 8651.8911805454. The cubic root of 74855221 is about 421.4447993259. Note that the first 3 decimals are identical.

It can be divided in two parts, 74855 and 221, that added together give a square (75076 = 274²).

The spelling of 74855221 in words is "seventy-four million, eight hundred fifty-five thousand, two hundred twenty-one".