1264720159 has 8 divisors (see below), whose sum is σ = 1320086880. Its totient is φ = 1209385056.

The previous prime is 1264720139. The next prime is 1264720181. The reversal of 1264720159 is 9510274621.

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 1264720159 - 2⁷ = 1264720031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264720129) 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, 114049 + ... + 124645.

It is an arithmetic number, because the mean of its divisors is an integer number (165010860).

Almost surely, 2^1264720159 is an apocalyptic number.

1264720159 is a deficient number, since it is larger than the sum of its proper divisors (55366721).

1264720159 is a wasteful number, since it uses less digits than its factorization.

1264720159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15809.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1264720159 is about 35562.9042542928. The cubic root of 1264720159 is about 1081.4293372040.

The spelling of 1264720159 in words is "one billion, two hundred sixty-four million, seven hundred twenty thousand, one hundred fifty-nine".