22266487 has 4 divisors (see below), whose sum is σ = 22276120. Its totient is φ = 22256856.

The previous prime is 22266479. The next prime is 22266511. The reversal of 22266487 is 78466222.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78466222 = 2 ⋅39233111.

It is a 3-Lehmer number, since φ(22266487) divides (22266487-1)³.

It is a cyclic number.

It is not a de Polignac number, because 22266487 - 2³ = 22266479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22266407) 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, 964 + ... + 6742.

It is an arithmetic number, because the mean of its divisors is an integer number (5569030).

Almost surely, 2^22266487 is an apocalyptic number.

22266487 is the 3853-rd pentagonal number.

22266487 is a deficient number, since it is larger than the sum of its proper divisors (9633).

22266487 is an equidigital number, since it uses as much as digits as its factorization.

22266487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9632.

The product of its digits is 64512, while the sum is 37.

The square root of 22266487 is about 4718.7378609115. The cubic root of 22266487 is about 281.3307697569.

The spelling of 22266487 in words is "twenty-two million, two hundred sixty-six thousand, four hundred eighty-seven".