7217864 has 16 divisors (see below), whose sum is σ = 13669020. Its totient is φ = 3572800.

The previous prime is 7217863. The next prime is 7217887. The reversal of 7217864 is 4687127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7022500 + 195364 = 2650^2 + 442^2 .

It is not an unprimeable number, because it can be changed into a prime (7217863) 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, 3659 + ... + 5274.

Almost surely, 2^7217864 is an apocalyptic number.

It is an amenable number.

7217864 is a deficient number, since it is larger than the sum of its proper divisors (6451156).

7217864 is a wasteful number, since it uses less digits than its factorization.

7217864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9040 (or 9036 counting only the distinct ones).

The product of its digits is 18816, while the sum is 35.

The square root of 7217864 is about 2686.6082706640. The cubic root of 7217864 is about 193.2574441218.

The spelling of 7217864 in words is "seven million, two hundred seventeen thousand, eight hundred sixty-four".