1604770691 has 4 divisors (see below), whose sum is σ = 1604893752. Its totient is φ = 1604647632.

The previous prime is 1604770639. The next prime is 1604770733. The reversal of 1604770691 is 1960774061.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1604770691 - 2¹⁸ = 1604508547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1604775691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39290 + ... + 68943.

It is an arithmetic number, because the mean of its divisors is an integer number (401223438).

Almost surely, 2^1604770691 is an apocalyptic number.

1604770691 is a deficient number, since it is larger than the sum of its proper divisors (123061).

1604770691 is a wasteful number, since it uses less digits than its factorization.

1604770691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123060.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 1604770691 is about 40059.5892515138. The cubic root of 1604770691 is about 1170.7684072535.

The spelling of 1604770691 in words is "one billion, six hundred four million, seven hundred seventy thousand, six hundred ninety-one".