1264049777 has 4 divisors (see below), whose sum is σ = 1277081316. Its totient is φ = 1251018240.

The previous prime is 1264049749. The next prime is 1264049779. The reversal of 1264049777 is 7779404621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7779404621 = 7643 ⋅1017847.

It can be written as a sum of positive squares in 2 ways, for example, as 824895841 + 439153936 = 28721^2 + 20956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1264049777 - 2¹² = 1264045681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264049779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6515624 + ... + 6515817.

It is an arithmetic number, because the mean of its divisors is an integer number (319270329).

Almost surely, 2^1264049777 is an apocalyptic number.

It is an amenable number.

1264049777 is a deficient number, since it is larger than the sum of its proper divisors (13031539).

1264049777 is an equidigital number, since it uses as much as digits as its factorization.

1264049777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13031538.

The product of its (nonzero) digits is 592704, while the sum is 47.

The square root of 1264049777 is about 35553.4777061260. The cubic root of 1264049777 is about 1081.2382280251.

The spelling of 1264049777 in words is "one billion, two hundred sixty-four million, forty-nine thousand, seven hundred seventy-seven".