87262561 has 4 divisors (see below), whose sum is σ = 87899652. Its totient is φ = 86625472.

The previous prime is 87262543. The next prime is 87262579. The reversal of 87262561 is 16526278.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (87262543) and next prime (87262579).

It can be written as a sum of positive squares in 2 ways, for example, as 21344400 + 65918161 = 4620^2 + 8119^2 .

It is a cyclic number.

It is not a de Polignac number, because 87262561 - 2¹¹ = 87260513 is a prime.

It is a super-2 number, since 2×87262561² = 15229509104557442, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87262561.

It is not an unprimeable number, because it can be changed into a prime (87262501) 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, 318340 + ... + 318613.

It is an arithmetic number, because the mean of its divisors is an integer number (21974913).

Almost surely, 2^87262561 is an apocalyptic number.

It is an amenable number.

87262561 is a deficient number, since it is larger than the sum of its proper divisors (637091).

87262561 is a wasteful number, since it uses less digits than its factorization.

87262561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637090.

The product of its digits is 40320, while the sum is 37.

The square root of 87262561 is about 9341.4431968513. The cubic root of 87262561 is about 443.5500694009.

The spelling of 87262561 in words is "eighty-seven million, two hundred sixty-two thousand, five hundred sixty-one".