748878649 has 2 divisors, whose sum is σ = 748878650. Its totient is φ = 748878648.

The previous prime is 748878623. The next prime is 748878671. The reversal of 748878649 is 946878847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 736579600 + 12299049 = 27140^2 + 3507^2 .

It is an emirp because it is prime and its reverse (946878847) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 748878649 - 2⁵ = 748878617 is a prime.

It is not a weakly prime, because it can be changed into another prime (748878149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374439324 + 374439325.

It is an arithmetic number, because the mean of its divisors is an integer number (374439325).

Almost surely, 2^748878649 is an apocalyptic number.

It is an amenable number.

748878649 is a deficient number, since it is larger than the sum of its proper divisors (1).

748878649 is an equidigital number, since it uses as much as digits as its factorization.

748878649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21676032, while the sum is 61.

The square root of 748878649 is about 27365.6472424827. The cubic root of 748878649 is about 908.1072638941.

The spelling of 748878649 in words is "seven hundred forty-eight million, eight hundred seventy-eight thousand, six hundred forty-nine".