1561280 has 112 divisors (see below), whose sum is σ = 4608576. Its totient is φ = 491520.

The previous prime is 1561279. The next prime is 1561303. The reversal of 1561280 is 821651.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38060 + ... + 38100.

It is an arithmetic number, because the mean of its divisors is an integer number (41148).

2^1561280 is an apocalyptic number.

1561280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1561280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2304288).

1561280 is an abundant number, since it is smaller than the sum of its proper divisors (3047296).

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

1561280 is a wasteful number, since it uses less digits than its factorization.

1561280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 72 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1561280 is about 1249.5119047052. The cubic root of 1561280 is about 116.0095117052.

The spelling of 1561280 in words is "one million, five hundred sixty-one thousand, two hundred eighty".