1604561544 has 24 divisors (see below), whose sum is σ = 4345687710. Its totient is φ = 534853824.

The previous prime is 1604561521. The next prime is 1604561587. The reversal of 1604561544 is 4451654061.

1604561544 is a `hidden beast` number, since 1 + 60 + 4 + 56 + 1 + 544 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1130976900 + 473584644 = 33630^2 + 21762^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1604561499 and 1604561508.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11142717 + ... + 11142860.

Almost surely, 2^1604561544 is an apocalyptic number.

It is an amenable number.

1604561544 is an abundant number, since it is smaller than the sum of its proper divisors (2741126166).

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

1604561544 is a wasteful number, since it uses less digits than its factorization.

1604561544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22285589 (or 22285582 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 1604561544 is about 40056.9787178214. The cubic root of 1604561544 is about 1170.7175436338.

The spelling of 1604561544 in words is "one billion, six hundred four million, five hundred sixty-one thousand, five hundred forty-four".