1561904448 has 56 divisors (see below), whose sum is σ = 4450433568. Its totient is φ = 480585216.

The previous prime is 1561904441. The next prime is 1561904473. The reversal of 1561904448 is 8444091651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561904441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 310386 + ... + 315377.

It is an arithmetic number, because the mean of its divisors is an integer number (79472028).

Almost surely, 2^1561904448 is an apocalyptic number.

It is an amenable number.

1561904448 is an abundant number, since it is smaller than the sum of its proper divisors (2888529120).

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

1561904448 is a wasteful number, since it uses less digits than its factorization.

1561904448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625791 (or 625781 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 1561904448 is about 39520.9368310014. The cubic root of 1561904448 is about 1160.2497599341.

The spelling of 1561904448 in words is "one billion, five hundred sixty-one million, nine hundred four thousand, four hundred forty-eight".