216622454 has 4 divisors (see below), whose sum is σ = 324933684. Its totient is φ = 108311226.

The previous prime is 216622411. The next prime is 216622499. The reversal of 216622454 is 454226612.

216622454 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 216622454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54155612 + ... + 54155615.

It is an arithmetic number, because the mean of its divisors is an integer number (81233421).

Almost surely, 2^216622454 is an apocalyptic number.

216622454 is a deficient number, since it is larger than the sum of its proper divisors (108311230).

216622454 is a wasteful number, since it uses less digits than its factorization.

216622454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108311229.

The product of its digits is 23040, while the sum is 32.

The square root of 216622454 is about 14718.0995376441. The cubic root of 216622454 is about 600.5757935558.

The spelling of 216622454 in words is "two hundred sixteen million, six hundred twenty-two thousand, four hundred fifty-four".