7720868 has 12 divisors (see below), whose sum is σ = 13531980. Its totient is φ = 3854592.

The previous prime is 7720861. The next prime is 7720871. The reversal of 7720868 is 8680277.

It can be written as a sum of positive squares in 2 ways, for example, as 4700224 + 3020644 = 2168^2 + 1738^2 .

It is a super-2 number, since 2×7720868² = 119223605346848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7720861) 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, 3080 + ... + 4992.

It is an arithmetic number, because the mean of its divisors is an integer number (1127665).

Almost surely, 2^7720868 is an apocalyptic number.

It is an amenable number.

7720868 is a deficient number, since it is larger than the sum of its proper divisors (5811112).

7720868 is a wasteful number, since it uses less digits than its factorization.

7720868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926 (or 2924 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 7720868 is about 2778.6449935175. The cubic root of 7720868 is about 197.6463093612.

The spelling of 7720868 in words is "seven million, seven hundred twenty thousand, eight hundred sixty-eight".