87656537 has 2 divisors, whose sum is σ = 87656538. Its totient is φ = 87656536.

The previous prime is 87656533. The next prime is 87656563. The reversal of 87656537 is 73565678.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87534736 + 121801 = 9356^2 + 349^2 .

It is a cyclic number.

It is not a de Polignac number, because 87656537 - 2² = 87656533 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 87656491 and 87656500.

It is not a weakly prime, because it can be changed into another prime (87656533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43828268 + 43828269.

It is an arithmetic number, because the mean of its divisors is an integer number (43828269).

Almost surely, 2^87656537 is an apocalyptic number.

It is an amenable number.

87656537 is a deficient number, since it is larger than the sum of its proper divisors (1).

87656537 is an equidigital number, since it uses as much as digits as its factorization.

87656537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 47.

The square root of 87656537 is about 9362.5069826409. The cubic root of 87656537 is about 444.2165856846.

The spelling of 87656537 in words is "eighty-seven million, six hundred fifty-six thousand, five hundred thirty-seven".