1561562072 has 96 divisors (see below), whose sum is σ = 3521905920. Its totient is φ = 635698560.

The previous prime is 1561562003. The next prime is 1561562077. The reversal of 1561562072 is 2702651651.

It is a super-2 number, since 2×1561562072² = 4876952209417866368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561562077) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3343583 + ... + 3344049.

It is an arithmetic number, because the mean of its divisors is an integer number (36686520).

Almost surely, 2^1561562072 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 1561562072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1760952960).

1561562072 is an abundant number, since it is smaller than the sum of its proper divisors (1960343848).

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

1561562072 is a wasteful number, since it uses less digits than its factorization.

1561562072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609 (or 576 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 1561562072 is about 39516.6050161195. The cubic root of 1561562072 is about 1160.1649765357.

The spelling of 1561562072 in words is "one billion, five hundred sixty-one million, five hundred sixty-two thousand, seventy-two".