87655679 has 2 divisors, whose sum is σ = 87655680. Its totient is φ = 87655678.

The previous prime is 87655669. The next prime is 87655697. The reversal of 87655679 is 97655678.

It is a happy number.

Together with next prime (87655697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87655679 - 2¹² = 87651583 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87655679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87655609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43827839 + 43827840.

It is an arithmetic number, because the mean of its divisors is an integer number (43827840).

Almost surely, 2^87655679 is an apocalyptic number.

87655679 is a deficient number, since it is larger than the sum of its proper divisors (1).

87655679 is an equidigital number, since it uses as much as digits as its factorization.

87655679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 53.

The square root of 87655679 is about 9362.4611614682. The cubic root of 87655679 is about 444.2151363192.

Subtracting 87655679 from its reverse (97655678), we obtain a palindrome (9999999).

The spelling of 87655679 in words is "eighty-seven million, six hundred fifty-five thousand, six hundred seventy-nine".