1213641264 has 80 divisors (see below), whose sum is σ = 3600305280. Its totient is φ = 348410880.

The previous prime is 1213641257. The next prime is 1213641277. The reversal of 1213641264 is 4621463121.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50457 + ... + 70520.

It is an arithmetic number, because the mean of its divisors is an integer number (45003816).

Almost surely, 2^1213641264 is an apocalyptic number.

It is an amenable number.

1213641264 is an abundant number, since it is smaller than the sum of its proper divisors (2386664016).

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

1213641264 is a wasteful number, since it uses less digits than its factorization.

1213641264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121018 (or 121012 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 1213641264 is about 34837.3544345721. The cubic root of 1213641264 is about 1066.6700751627.

The spelling of 1213641264 in words is "one billion, two hundred thirteen million, six hundred forty-one thousand, two hundred sixty-four".