15564222 has 12 divisors (see below), whose sum is σ = 33722520. Its totient is φ = 5188068.

The previous prime is 15564217. The next prime is 15564223. The reversal of 15564222 is 22246551.

15564222 is a `hidden beast` number, since 15 + 5 + 642 + 2 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15564223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432322 + ... + 432357.

It is an arithmetic number, because the mean of its divisors is an integer number (2810210).

Almost surely, 2^15564222 is an apocalyptic number.

15564222 is an abundant number, since it is smaller than the sum of its proper divisors (18158298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15564222 is a wasteful number, since it uses less digits than its factorization.

15564222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864687 (or 864684 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 15564222 is about 3945.1517081096. The cubic root of 15564222 is about 249.6754294649.

It can be divided in two parts, 1556 and 4222, that added together give a triangular number (5778 = T₁₀₇).

The spelling of 15564222 in words is "fifteen million, five hundred sixty-four thousand, two hundred twenty-two".