87776537 has 2 divisors, whose sum is σ = 87776538. Its totient is φ = 87776536.

The previous prime is 87776509. The next prime is 87776539. The reversal of 87776537 is 73567778.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79138816 + 8637721 = 8896^2 + 2939^2 .

It is a cyclic number.

It is not a de Polignac number, because 87776537 - 2⁸ = 87776281 is a prime.

Together with 87776539, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87776539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43888268 + 43888269.

It is an arithmetic number, because the mean of its divisors is an integer number (43888269).

Almost surely, 2^87776537 is an apocalyptic number.

It is an amenable number.

87776537 is a deficient number, since it is larger than the sum of its proper divisors (1).

87776537 is an equidigital number, since it uses as much as digits as its factorization.

87776537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728720, while the sum is 50.

The square root of 87776537 is about 9368.9133307978. The cubic root of 87776537 is about 444.4192010501.

The spelling of 87776537 in words is "eighty-seven million, seven hundred seventy-six thousand, five hundred thirty-seven".