7748638477 has 2 divisors, whose sum is σ = 7748638478. Its totient is φ = 7748638476.

The previous prime is 7748638459. The next prime is 7748638481. The reversal of 7748638477 is 7748368477.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6769011076 + 979627401 = 82274^2 + 31299^2 .

It is a cyclic number.

It is not a de Polignac number, because 7748638477 - 2¹⁹ = 7748114189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7748636477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3874319238 + 3874319239.

It is an arithmetic number, because the mean of its divisors is an integer number (3874319239).

Almost surely, 2^7748638477 is an apocalyptic number.

It is an amenable number.

7748638477 is a deficient number, since it is larger than the sum of its proper divisors (1).

7748638477 is an equidigital number, since it uses as much as digits as its factorization.

7748638477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 44255232, while the sum is 61.

The square root of 7748638477 is about 88026.3510376296. The cubic root of 7748638477 is about 1978.8299107315.

The spelling of 7748638477 in words is "seven billion, seven hundred forty-eight million, six hundred thirty-eight thousand, four hundred seventy-seven".