7788481 has 2 divisors, whose sum is σ = 7788482. Its totient is φ = 7788480.

The previous prime is 7788457. The next prime is 7788493. The reversal of 7788481 is 1848877.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7612081 + 176400 = 2759^2 + 420^2 .

It is an emirp because it is prime and its reverse (1848877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7788481 - 2⁷ = 7788353 is a prime.

It is a super-2 number, since 2×7788481² = 121320872574722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7788181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3894240 + 3894241.

It is an arithmetic number, because the mean of its divisors is an integer number (3894241).

Almost surely, 2^7788481 is an apocalyptic number.

It is an amenable number.

7788481 is a deficient number, since it is larger than the sum of its proper divisors (1).

7788481 is an equidigital number, since it uses as much as digits as its factorization.

7788481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 43.

The square root of 7788481 is about 2790.7850150092. The cubic root of 7788481 is about 198.2215745547.

The spelling of 7788481 in words is "seven million, seven hundred eighty-eight thousand, four hundred eighty-one".