8772221 has 8 divisors (see below), whose sum is σ = 9486720. Its totient is φ = 8079808.

The previous prime is 8772209. The next prime is 8772229. The reversal of 8772221 is 1222778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8772221 - 2⁶ = 8772157 is a prime.

It is a super-2 number, since 2×8772221² = 153903722545682, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8772229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4691 + ... + 6288.

It is an arithmetic number, because the mean of its divisors is an integer number (1185840).

Almost surely, 2^8772221 is an apocalyptic number.

It is an amenable number.

8772221 is a deficient number, since it is larger than the sum of its proper divisors (714499).

8772221 is a wasteful number, since it uses less digits than its factorization.

8772221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11043.

The product of its digits is 3136, while the sum is 29.

The square root of 8772221 is about 2961.7935444592. The cubic root of 8772221 is about 206.2385538796.

Adding to 8772221 its reverse (1222778), we get a palindrome (9994999).

The spelling of 8772221 in words is "eight million, seven hundred seventy-two thousand, two hundred twenty-one".