1604642867 has 4 divisors (see below), whose sum is σ = 1605194016. Its totient is φ = 1604091720.

The previous prime is 1604642849. The next prime is 1604642887. The reversal of 1604642867 is 7682464061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7682464061 = 127 ⋅60491843.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1604642867 is a prime.

It is a super-2 number, since 2×1604642867² = 5149757461227959378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604642887) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 271184 + ... + 277037.

It is an arithmetic number, because the mean of its divisors is an integer number (401298504).

Almost surely, 2^1604642867 is an apocalyptic number.

1604642867 is a deficient number, since it is larger than the sum of its proper divisors (551149).

1604642867 is an equidigital number, since it uses as much as digits as its factorization.

1604642867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551148.

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 1604642867 is about 40057.9937964946. The cubic root of 1604642867 is about 1170.7373215506.

The spelling of 1604642867 in words is "one billion, six hundred four million, six hundred forty-two thousand, eight hundred sixty-seven".