1491669504 has 240 divisors, whose sum is σ = 4768595832. Its totient is φ = 445906944.

The previous prime is 1491669493. The next prime is 1491669521. The reversal of 1491669504 is 4059661941.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1211040000 + 280629504 = 34800^2 + 16752^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1491669504.

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, 2216112 + ... + 2216784.

Almost surely, 2^1491669504 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 1491669504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384297916).

1491669504 is an abundant number, since it is smaller than the sum of its proper divisors (3276926328).

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

1491669504 is a wasteful number, since it uses less digits than its factorization.

1491669504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 1491669504 is about 38622.1374861620. The cubic root of 1491669504 is about 1142.5911880191.

The spelling of 1491669504 in words is "one billion, four hundred ninety-one million, six hundred sixty-nine thousand, five hundred four".