87609647 has 2 divisors, whose sum is σ = 87609648. Its totient is φ = 87609646.

The previous prime is 87609629. The next prime is 87609649. The reversal of 87609647 is 74690678.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87609647 - 2⁸ = 87609391 is a prime.

Together with 87609649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87609649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43804823 + 43804824.

It is an arithmetic number, because the mean of its divisors is an integer number (43804824).

Almost surely, 2^87609647 is an apocalyptic number.

87609647 is a deficient number, since it is larger than the sum of its proper divisors (1).

87609647 is an equidigital number, since it uses as much as digits as its factorization.

87609647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 87609647 is about 9360.0025106834. The cubic root of 87609647 is about 444.1373634856.

Subtracting from 87609647 its sum of digits (47), we obtain a square (87609600 = 9360²).

The spelling of 87609647 in words is "eighty-seven million, six hundred nine thousand, six hundred forty-seven".