87776539 has 2 divisors, whose sum is σ = 87776540. Its totient is φ = 87776538.

The previous prime is 87776537. The next prime is 87776581. The reversal of 87776539 is 93567778.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87776539 - 2¹ = 87776537 is a prime.

Together with 87776537, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87776537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43888269 + 43888270.

It is an arithmetic number, because the mean of its divisors is an integer number (43888270).

Almost surely, 2^87776539 is an apocalyptic number.

87776539 is a deficient number, since it is larger than the sum of its proper divisors (1).

87776539 is an equidigital number, since it uses as much as digits as its factorization.

87776539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2222640, while the sum is 52.

The square root of 87776539 is about 9368.9134375337. The cubic root of 87776539 is about 444.4192044254.

The spelling of 87776539 in words is "eighty-seven million, seven hundred seventy-six thousand, five hundred thirty-nine".