1264891673 has 8 divisors (see below), whose sum is σ = 1281646080. Its totient is φ = 1248156000.

The previous prime is 1264891651. The next prime is 1264891711. The reversal of 1264891673 is 3761984621.

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

It is a cyclic number.

It is not a de Polignac number, because 1264891673 - 2⁶ = 1264891609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1264891643) 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, 177173 + ... + 184173.

It is an arithmetic number, because the mean of its divisors is an integer number (160205760).

Almost surely, 2^1264891673 is an apocalyptic number.

It is an amenable number.

1264891673 is a deficient number, since it is larger than the sum of its proper divisors (16754407).

1264891673 is an equidigital number, since it uses as much as digits as its factorization.

1264891673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9367.

The product of its digits is 435456, while the sum is 47.

The square root of 1264891673 is about 35565.3155897709. The cubic root of 1264891673 is about 1081.4782207155.

The spelling of 1264891673 in words is "one billion, two hundred sixty-four million, eight hundred ninety-one thousand, six hundred seventy-three".