1604689380 has 216 divisors, whose sum is σ = 5779894848. Its totient is φ = 366576192.

The previous prime is 1604689367. The next prime is 1604689397. The reversal of 1604689380 is 839864061.

1604689380 is a `hidden beast` number, since 1 + 604 + 6 + 8 + 9 + 38 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 917667 + ... + 919413.

Almost surely, 2^1604689380 is an apocalyptic number.

1604689380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1604689380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2889947424).

1604689380 is an abundant number, since it is smaller than the sum of its proper divisors (4175205468).

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

1604689380 is an equidigital number, since it uses as much as digits as its factorization.

1604689380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1787 (or 1764 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 1604689380 is about 40058.5743630499. The cubic root of 1604689380 is about 1170.7486333052.

The spelling of 1604689380 in words is "one billion, six hundred four million, six hundred eighty-nine thousand, three hundred eighty".