1561756704 has 48 divisors (see below), whose sum is σ = 4107112128. Its totient is φ = 519633152.

The previous prime is 1561756631. The next prime is 1561756711. The reversal of 1561756704 is 4076571651.

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38869 + ... + 68075.

It is an arithmetic number, because the mean of its divisors is an integer number (85564836).

Almost surely, 2^1561756704 is an apocalyptic number.

It is an amenable number.

1561756704 is an abundant number, since it is smaller than the sum of its proper divisors (2545355424).

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

1561756704 is a wasteful number, since it uses less digits than its factorization.

1561756704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29777 (or 29769 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 42.

The square root of 1561756704 is about 39519.0676003369. The cubic root of 1561756704 is about 1160.2131752493.

The spelling of 1561756704 in words is "one billion, five hundred sixty-one million, seven hundred fifty-six thousand, seven hundred four".