1264747765 has 8 divisors (see below), whose sum is σ = 1566655488. Its totient is φ = 979159440.

The previous prime is 1264747699. The next prime is 1264747843. The reversal of 1264747765 is 5677474621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1264747765 - 2¹¹ = 1264745717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4079677 + ... + 4079986.

It is an arithmetic number, because the mean of its divisors is an integer number (195831936).

Almost surely, 2^1264747765 is an apocalyptic number.

It is an amenable number.

1264747765 is a deficient number, since it is larger than the sum of its proper divisors (301907723).

1264747765 is an equidigital number, since it uses as much as digits as its factorization.

1264747765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8159699.

The product of its digits is 1975680, while the sum is 49.

The square root of 1264747765 is about 35563.2923813305. The cubic root of 1264747765 is about 1081.4372055378.

The spelling of 1264747765 in words is "one billion, two hundred sixty-four million, seven hundred forty-seven thousand, seven hundred sixty-five".