1604354640 has 80 divisors (see below), whose sum is σ = 5684005248. Its totient is φ = 366709248.

The previous prime is 1604354629. The next prime is 1604354671. The reversal of 1604354640 is 464534061.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475807 + ... + 479166.

Almost surely, 2^1604354640 is an apocalyptic number.

1604354640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1604354640 is an abundant number, since it is smaller than the sum of its proper divisors (4079650608).

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

1604354640 is a wasteful number, since it uses less digits than its factorization.

1604354640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954996 (or 954990 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 1604354640 is about 40054.3960134215. The cubic root of 1604354640 is about 1170.6672211525.

The spelling of 1604354640 in words is "one billion, six hundred four million, three hundred fifty-four thousand, six hundred forty".