1264726813 has 8 divisors (see below), whose sum is σ = 1445774528. Its totient is φ = 1083772224.

The previous prime is 1264726741. The next prime is 1264726843. The reversal of 1264726813 is 3186274621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1264726813 is a prime.

It is a super-2 number, since 2×1264726813² = 3199067823042273938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264726843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8770 + ... + 51052.

It is an arithmetic number, because the mean of its divisors is an integer number (180721816).

Almost surely, 2^1264726813 is an apocalyptic number.

It is an amenable number.

1264726813 is a deficient number, since it is larger than the sum of its proper divisors (181047715).

1264726813 is an equidigital number, since it uses as much as digits as its factorization.

1264726813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46563.

The product of its digits is 96768, while the sum is 40.

The square root of 1264726813 is about 35562.9978067092. The cubic root of 1264726813 is about 1081.4312337548.

The spelling of 1264726813 in words is "one billion, two hundred sixty-four million, seven hundred twenty-six thousand, eight hundred thirteen".