1264885216 has 120 divisors (see below), whose sum is σ = 2951873064. Its totient is φ = 533433600.

The previous prime is 1264885201. The next prime is 1264885267. The reversal of 1264885216 is 6125884621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7759951 + ... + 7760113.

Almost surely, 2^1264885216 is an apocalyptic number.

1264885216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1264885216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1475936532).

1264885216 is an abundant number, since it is smaller than the sum of its proper divisors (1686987848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1264885216 is an equidigital number, since it uses as much as digits as its factorization.

1264885216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 273 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The square root of 1264885216 is about 35565.2248130108. The cubic root of 1264885216 is about 1081.4763804744.

The spelling of 1264885216 in words is "one billion, two hundred sixty-four million, eight hundred eighty-five thousand, two hundred sixteen".