7620561 has 20 divisors (see below), whose sum is σ = 12261172. Its totient is φ = 4688928.

The previous prime is 7620559. The next prime is 7620593. The reversal of 7620561 is 1650267.

It can be written as a sum of positive squares in 2 ways, for example, as 2954961 + 4665600 = 1719^2 + 2160^2 .

It is not a de Polignac number, because 7620561 - 2¹ = 7620559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7620541) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2566 + ... + 4671.

Almost surely, 2^7620561 is an apocalyptic number.

It is an amenable number.

7620561 is a deficient number, since it is larger than the sum of its proper divisors (4640611).

7620561 is a wasteful number, since it uses less digits than its factorization.

7620561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7262 (or 7253 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 7620561 is about 2760.5363609270. The cubic root of 7620561 is about 196.7866569627.

The spelling of 7620561 in words is "seven million, six hundred twenty thousand, five hundred sixty-one".