7216655 has 4 divisors (see below), whose sum is σ = 8659992. Its totient is φ = 5773320.

The previous prime is 7216633. The next prime is 7216661. The reversal of 7216655 is 5566127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5566127 = 7 ⋅795161.

It is not a de Polignac number, because 7216655 - 2¹⁸ = 6954511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721661 + ... + 721670.

It is an arithmetic number, because the mean of its divisors is an integer number (2164998).

Almost surely, 2^7216655 is an apocalyptic number.

7216655 is a deficient number, since it is larger than the sum of its proper divisors (1443337).

7216655 is a wasteful number, since it uses less digits than its factorization.

7216655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443336.

The product of its digits is 12600, while the sum is 32.

The square root of 7216655 is about 2686.3832563504. The cubic root of 7216655 is about 193.2466532425.

The spelling of 7216655 in words is "seven million, two hundred sixteen thousand, six hundred fifty-five".