1264339356 has 72 divisors (see below), whose sum is σ = 3459004416. Its totient is φ = 358374240.

The previous prime is 1264339343. The next prime is 1264339381. The reversal of 1264339356 is 6539334621.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 66211 + ... + 83141.

It is an arithmetic number, because the mean of its divisors is an integer number (48041728).

Almost surely, 2^1264339356 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 1264339356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1729502208).

1264339356 is an abundant number, since it is smaller than the sum of its proper divisors (2194665060).

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

1264339356 is a wasteful number, since it uses less digits than its factorization.

1264339356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17079 (or 17070 counting only the distinct ones).

The product of its digits is 349920, while the sum is 42.

The square root of 1264339356 is about 35557.5499155946. The cubic root of 1264339356 is about 1081.3207880593.

The spelling of 1264339356 in words is "one billion, two hundred sixty-four million, three hundred thirty-nine thousand, three hundred fifty-six".