1561604304 has 40 divisors (see below), whose sum is σ = 4344464992. Its totient is φ = 480493440.

The previous prime is 1561604293. The next prime is 1561604327. The reversal of 1561604304 is 4034061651.

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, 1250662 + ... + 1251909.

Almost surely, 2^1561604304 is an apocalyptic number.

It is an amenable number.

1561604304 is an abundant number, since it is smaller than the sum of its proper divisors (2782860688).

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

1561604304 is a wasteful number, since it uses less digits than its factorization.

1561604304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2502595 (or 2502589 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 1561604304 is about 39517.1393701518. The cubic root of 1561604304 is about 1160.1754352182.

Adding to 1561604304 its reverse (4034061651), we get a palindrome (5595665955).

The spelling of 1561604304 in words is "one billion, five hundred sixty-one million, six hundred four thousand, three hundred four".