775428457 has 2 divisors, whose sum is σ = 775428458. Its totient is φ = 775428456.

The previous prime is 775428443. The next prime is 775428461. The reversal of 775428457 is 754824577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 752350041 + 23078416 = 27429^2 + 4804^2 .

It is a cyclic number.

It is not a de Polignac number, because 775428457 - 2¹⁵ = 775395689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 775428457.

It is not a weakly prime, because it can be changed into another prime (775428257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387714228 + 387714229.

It is an arithmetic number, because the mean of its divisors is an integer number (387714229).

Almost surely, 2^775428457 is an apocalyptic number.

It is an amenable number.

775428457 is a deficient number, since it is larger than the sum of its proper divisors (1).

775428457 is an equidigital number, since it uses as much as digits as its factorization.

775428457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2195200, while the sum is 49.

The square root of 775428457 is about 27846.5160657487. The cubic root of 775428457 is about 918.7145157165.

The spelling of 775428457 in words is "seven hundred seventy-five million, four hundred twenty-eight thousand, four hundred fifty-seven".