7928881 has 2 divisors, whose sum is σ = 7928882. Its totient is φ = 7928880.

The previous prime is 7928863. The next prime is 7928897. The reversal of 7928881 is 1888297.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7263025 + 665856 = 2695^2 + 816^2 .

It is a cyclic number.

It is not a de Polignac number, because 7928881 - 2⁵ = 7928849 is a prime.

It is a super-2 number, since 2×7928881² = 125734307824322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7928801) by changing a digit.

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 as a sum of consecutive naturals, namely, 3964440 + 3964441.

It is an arithmetic number, because the mean of its divisors is an integer number (3964441).

Almost surely, 2^7928881 is an apocalyptic number.

It is an amenable number.

7928881 is a deficient number, since it is larger than the sum of its proper divisors (1).

7928881 is an equidigital number, since it uses as much as digits as its factorization.

7928881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 43.

The square root of 7928881 is about 2815.8268767806. The cubic root of 7928881 is about 199.4055767218.

The spelling of 7928881 in words is "seven million, nine hundred twenty-eight thousand, eight hundred eighty-one".