746778257 has 2 divisors, whose sum is σ = 746778258. Its totient is φ = 746778256.

The previous prime is 746778209. The next prime is 746778269. The reversal of 746778257 is 752877647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 625800256 + 120978001 = 25016^2 + 10999^2 .

It is a cyclic number.

It is not a de Polignac number, because 746778257 - 2⁸ = 746778001 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 746778199 and 746778208.

It is not a weakly prime, because it can be changed into another prime (746778457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373389128 + 373389129.

It is an arithmetic number, because the mean of its divisors is an integer number (373389129).

Almost surely, 2^746778257 is an apocalyptic number.

It is an amenable number.

746778257 is a deficient number, since it is larger than the sum of its proper divisors (1).

746778257 is an equidigital number, since it uses as much as digits as its factorization.

746778257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4609920, while the sum is 53.

The square root of 746778257 is about 27327.2438602944. The cubic root of 746778257 is about 907.2574745727.

The spelling of 746778257 in words is "seven hundred forty-six million, seven hundred seventy-eight thousand, two hundred fifty-seven".