1331604756 has 36 divisors (see below), whose sum is σ = 3368449812. Its totient is φ = 443545344.

The previous prime is 1331604749. The next prime is 1331604761. The reversal of 1331604756 is 6574061331.

1331604756 is a `hidden beast` number, since 13 + 31 + 604 + 7 + 5 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 661312656 + 670292100 = 25716^2 + 25890^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 1331604756.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39580 + ... + 65036.

Almost surely, 2^1331604756 is an apocalyptic number.

It is an amenable number.

1331604756 is an abundant number, since it is smaller than the sum of its proper divisors (2036845056).

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

1331604756 is a wasteful number, since it uses less digits than its factorization.

1331604756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26920 (or 26915 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 1331604756 is about 36491.1599706011. The cubic root of 1331604756 is about 1100.1665742232.

The spelling of 1331604756 in words is "one billion, three hundred thirty-one million, six hundred four thousand, seven hundred fifty-six".