74870221 has 4 divisors (see below), whose sum is σ = 78125472. Its totient is φ = 71614972.

The previous prime is 74870209. The next prime is 74870231. The reversal of 74870221 is 12207847.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12207847 = 467 ⋅26141.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74870221 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74870231) 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, 1627591 + ... + 1627636.

It is an arithmetic number, because the mean of its divisors is an integer number (19531368).

Almost surely, 2^74870221 is an apocalyptic number.

It is an amenable number.

74870221 is a deficient number, since it is larger than the sum of its proper divisors (3255251).

74870221 is a wasteful number, since it uses less digits than its factorization.

74870221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255250.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 74870221 is about 8652.7579996207. The cubic root of 74870221 is about 421.4729481073.

The spelling of 74870221 in words is "seventy-four million, eight hundred seventy thousand, two hundred twenty-one".