7721056 has 24 divisors (see below), whose sum is σ = 17372880. Its totient is φ = 3308928.

The previous prime is 7721053. The next prime is 7721057. The reversal of 7721056 is 6501277.

It is a super-2 number, since 2×7721056² = 119229411510272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a d-powerful number, because it can be written as 7⁴ + 7⁸ + 2⁹ + 1 + 0 + 5⁹ + 6³ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7721053) 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, 17011 + ... + 17458.

It is an arithmetic number, because the mean of its divisors is an integer number (723870).

Almost surely, 2^7721056 is an apocalyptic number.

It is an amenable number.

7721056 is an abundant number, since it is smaller than the sum of its proper divisors (9651824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7721056 is a wasteful number, since it uses less digits than its factorization.

7721056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34486 (or 34478 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 28.

The square root of 7721056 is about 2778.6788227501. The cubic root of 7721056 is about 197.6479135506.

The spelling of 7721056 in words is "seven million, seven hundred twenty-one thousand, fifty-six".