1561453072 has 40 divisors (see below), whose sum is σ = 3163029696. Its totient is φ = 745320576.

The previous prime is 1561453057. The next prime is 1561453073. The reversal of 1561453072 is 2703541651.

It is not an unprimeable number, because it can be changed into a prime (1561453073) 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, 197418 + ... + 205174.

Almost surely, 2^1561453072 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 1561453072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1581514848).

1561453072 is an abundant number, since it is smaller than the sum of its proper divisors (1601576624).

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

1561453072 is a wasteful number, since it uses less digits than its factorization.

1561453072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8335 (or 8329 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 1561453072 is about 39515.2258249905. The cubic root of 1561453072 is about 1160.1379820010.

It can be divided in two parts, 15614 and 53072, that added together give a palindrome (68686).

The spelling of 1561453072 in words is "one billion, five hundred sixty-one million, four hundred fifty-three thousand, seventy-two".