1604860257 has 64 divisors (see below), whose sum is σ = 2881234944. Its totient is φ = 767370240.

The previous prime is 1604860249. The next prime is 1604860267. The reversal of 1604860257 is 7520684061.

It is not a de Polignac number, because 1604860257 - 2³ = 1604860249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1604860207) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1642153 + ... + 1643129.

It is an arithmetic number, because the mean of its divisors is an integer number (45019296).

Almost surely, 2^1604860257 is an apocalyptic number.

It is an amenable number.

1604860257 is a deficient number, since it is larger than the sum of its proper divisors (1276374687).

1604860257 is a wasteful number, since it uses less digits than its factorization.

1604860257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 1604860257 is about 40060.7071455310. The cubic root of 1604860257 is about 1170.7901879546.

The spelling of 1604860257 in words is "one billion, six hundred four million, eight hundred sixty thousand, two hundred fifty-seven".