1561734272 has 72 divisors (see below), whose sum is σ = 3626497035. Its totient is φ = 667973376.

The previous prime is 1561734271. The next prime is 1561734301. The reversal of 1561734272 is 2724371651.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 780867136 + 780867136 = 27944^2 + 27944^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=27944.

It is not an unprimeable number, because it can be changed into a prime (1561734271) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3129479 + ... + 3129977.

Almost surely, 2^1561734272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561734272

1561734272 is an abundant number, since it is smaller than the sum of its proper divisors (2064762763).

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

1561734272 is an frugal number, since it uses more digits than its factorization.

1561734272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026 (or 508 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 1561734272 is about 39518.7837869538. The cubic root of 1561734272 is about 1160.2076203878.

The spelling of 1561734272 in words is "one billion, five hundred sixty-one million, seven hundred thirty-four thousand, two hundred seventy-two".