1264158216 has 96 divisors (see below), whose sum is σ = 3632428800. Its totient is φ = 395804160.

The previous prime is 1264158209. The next prime is 1264158221. The reversal of 1264158216 is 6128514621.

It is a happy number.

1264158216 is a `hidden beast` number, since 1 + 2 + 64 + 1 + 582 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1026321 + ... + 1027551.

It is an arithmetic number, because the mean of its divisors is an integer number (37837800).

Almost surely, 2^1264158216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1264158216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1816214400).

1264158216 is an abundant number, since it is smaller than the sum of its proper divisors (2368270584).

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

1264158216 is a wasteful number, since it uses less digits than its factorization.

1264158216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099 (or 2092 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1264158216 is about 35555.0026859794. The cubic root of 1264158216 is about 1081.2691458581.

The spelling of 1264158216 in words is "one billion, two hundred sixty-four million, one hundred fifty-eight thousand, two hundred sixteen".