1604711920 has 40 divisors (see below), whose sum is σ = 4263950304. Its totient is φ = 550186752.

The previous prime is 1604711893. The next prime is 1604711947. The reversal of 1604711920 is 291174061.

It is an interprime number because it is at equal distance from previous prime (1604711893) and next prime (1604711947).

It is a tau number, because it is divible by the number of its divisors (40).

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432219 + ... + 1433338.

Almost surely, 2^1604711920 is an apocalyptic number.

1604711920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1604711920 is an abundant number, since it is smaller than the sum of its proper divisors (2659238384).

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

1604711920 is a wasteful number, since it uses less digits than its factorization.

1604711920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865577 (or 2865571 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 1604711920 is about 40058.8557000821. The cubic root of 1604711920 is about 1170.7541148543.

Adding to 1604711920 its reverse (291174061), we get a palindrome (1895885981).

The spelling of 1604711920 in words is "one billion, six hundred four million, seven hundred eleven thousand, nine hundred twenty".