1604685730 has 16 divisors (see below), whose sum is σ = 2889726840. Its totient is φ = 641587072.

The previous prime is 1604685713. The next prime is 1604685737. The reversal of 1604685730 is 375864061.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1309498969 + 295186761 = 36187^2 + 17181^2 .

It is not an unprimeable number, because it can be changed into a prime (1604685737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11659 + ... + 57838.

Almost surely, 2^1604685730 is an apocalyptic number.

1604685730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1604685730 is a deficient number, since it is larger than the sum of its proper divisors (1285041110).

1604685730 is a wasteful number, since it uses less digits than its factorization.

1604685730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71813.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 1604685730 is about 40058.5288047377. The cubic root of 1604685730 is about 1170.7477456494.

The spelling of 1604685730 in words is "one billion, six hundred four million, six hundred eighty-five thousand, seven hundred thirty".