7821272 has 16 divisors (see below), whose sum is σ = 14803560. Its totient is φ = 3873664.

The previous prime is 7821257. The next prime is 7821277. The reversal of 7821272 is 2721287.

It is a super-2 number, since 2×7821272² = 122344591395968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7821277) 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, 3713 + ... + 5424.

Almost surely, 2^7821272 is an apocalyptic number.

It is an amenable number.

7821272 is a deficient number, since it is larger than the sum of its proper divisors (6982288).

7821272 is a wasteful number, since it uses less digits than its factorization.

7821272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250 (or 9246 counting only the distinct ones).

The product of its digits is 3136, while the sum is 29.

The square root of 7821272 is about 2796.6537147098. The cubic root of 7821272 is about 198.4993686889.

The spelling of 7821272 in words is "seven million, eight hundred twenty-one thousand, two hundred seventy-two".