7200661 has 4 divisors (see below), whose sum is σ = 7754572. Its totient is φ = 6646752.

The previous prime is 7200659. The next prime is 7200701. The reversal of 7200661 is 1660027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1660027 = 79 ⋅21013.

It can be written as a sum of positive squares in 2 ways, for example, as 4813636 + 2387025 = 2194^2 + 1545^2 .

It is a cyclic number.

It is not a de Polignac number, because 7200661 - 2¹ = 7200659 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7207661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276936 + ... + 276961.

It is an arithmetic number, because the mean of its divisors is an integer number (1938643).

Almost surely, 2^7200661 is an apocalyptic number.

It is an amenable number.

7200661 is a deficient number, since it is larger than the sum of its proper divisors (553911).

7200661 is a wasteful number, since it uses less digits than its factorization.

7200661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553910.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 7200661 is about 2683.4047402507. The cubic root of 7200661 is about 193.1037858929.

Adding to 7200661 its reverse (1660027), we get a palindrome (8860688).

The spelling of 7200661 in words is "seven million, two hundred thousand, six hundred sixty-one".