1264224729 has 4 divisors (see below), whose sum is σ = 1685632976. Its totient is φ = 842816484.

The previous prime is 1264224707. The next prime is 1264224743. The reversal of 1264224729 is 9274224621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1264224729 - 2²⁰ = 1263176153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264224779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210704119 + ... + 210704124.

It is an arithmetic number, because the mean of its divisors is an integer number (421408244).

Almost surely, 2^1264224729 is an apocalyptic number.

It is an amenable number.

1264224729 is a deficient number, since it is larger than the sum of its proper divisors (421408247).

1264224729 is an equidigital number, since it uses as much as digits as its factorization.

1264224729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421408246.

The product of its digits is 96768, while the sum is 39.

The square root of 1264224729 is about 35555.9380272832. The cubic root of 1264224729 is about 1081.2881089891.

The spelling of 1264224729 in words is "one billion, two hundred sixty-four million, two hundred twenty-four thousand, seven hundred twenty-nine".