22729555 has 4 divisors (see below), whose sum is σ = 27275472. Its totient is φ = 18183640.

The previous prime is 22729547. The next prime is 22729601. The reversal of 22729555 is 55592722.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 22729555 - 2³ = 22729547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2272951 + ... + 2272960.

It is an arithmetic number, because the mean of its divisors is an integer number (6818868).

Almost surely, 2^22729555 is an apocalyptic number.

22729555 is a deficient number, since it is larger than the sum of its proper divisors (4545917).

22729555 is an equidigital number, since it uses as much as digits as its factorization.

22729555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545916.

The product of its digits is 63000, while the sum is 37.

The square root of 22729555 is about 4767.5523070020. The cubic root of 22729555 is about 283.2676487490.

The spelling of 22729555 in words is "twenty-two million, seven hundred twenty-nine thousand, five hundred fifty-five".