1264489065 has 24 divisors (see below), whose sum is σ = 2504893248. Its totient is φ = 578052000.

The previous prime is 1264489063. The next prime is 1264489073. The reversal of 1264489065 is 5609844621.

It is not a de Polignac number, because 1264489065 - 2¹ = 1264489063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1264489065.

It is not an unprimeable number, because it can be changed into a prime (1264489063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2006811 + ... + 2007440.

It is an arithmetic number, because the mean of its divisors is an integer number (104370552).

Almost surely, 2^1264489065 is an apocalyptic number.

1264489065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1264489065 is a deficient number, since it is larger than the sum of its proper divisors (1240404183).

1264489065 is a wasteful number, since it uses less digits than its factorization.

1264489065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014269 (or 4014266 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 1264489065 is about 35559.6550180116. The cubic root of 1264489065 is about 1081.3634657007.

The spelling of 1264489065 in words is "one billion, two hundred sixty-four million, four hundred eighty-nine thousand, sixty-five".