1264890789 has 16 divisors (see below), whose sum is σ = 1901883840. Its totient is φ = 830673360.

The previous prime is 1264890787. The next prime is 1264890829. The reversal of 1264890789 is 9870984621.

It is not a de Polignac number, because 1264890789 - 2¹ = 1264890787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1264890787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347802 + ... + 351419.

It is an arithmetic number, because the mean of its divisors is an integer number (118867740).

Almost surely, 2^1264890789 is an apocalyptic number.

It is an amenable number.

1264890789 is a deficient number, since it is larger than the sum of its proper divisors (636993051).

1264890789 is an equidigital number, since it uses as much as digits as its factorization.

1264890789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699297 (or 699291 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 1264890789 is about 35565.3031619302. The cubic root of 1264890789 is about 1081.4779687764.

The spelling of 1264890789 in words is "one billion, two hundred sixty-four million, eight hundred ninety thousand, seven hundred eighty-nine".