7287561 has 6 divisors (see below), whose sum is σ = 10526490. Its totient is φ = 4858368.

The previous prime is 7287551. The next prime is 7287563. The reversal of 7287561 is 1657827.

7287561 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 553536 = 2595^2 + 744^2 .

It is not a de Polignac number, because 7287561 - 2⁷ = 7287433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7287563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 404856 + ... + 404873.

It is an arithmetic number, because the mean of its divisors is an integer number (1754415).

Almost surely, 2^7287561 is an apocalyptic number.

It is an amenable number.

7287561 is a deficient number, since it is larger than the sum of its proper divisors (3238929).

7287561 is a wasteful number, since it uses less digits than its factorization.

7287561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 809735 (or 809732 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 7287561 is about 2699.5482955487. The cubic root of 7287561 is about 193.8774955501.

The spelling of 7287561 in words is "seven million, two hundred eighty-seven thousand, five hundred sixty-one".