87979847 has 2 divisors, whose sum is σ = 87979848. Its totient is φ = 87979846.

The previous prime is 87979831. The next prime is 87979897. The reversal of 87979847 is 74897978.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87979847 - 2⁴ = 87979831 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87979897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43989923 + 43989924.

It is an arithmetic number, because the mean of its divisors is an integer number (43989924).

Almost surely, 2^87979847 is an apocalyptic number.

87979847 is a deficient number, since it is larger than the sum of its proper divisors (1).

87979847 is an equidigital number, since it uses as much as digits as its factorization.

87979847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7112448, while the sum is 59.

The square root of 87979847 is about 9379.7572996320. The cubic root of 87979847 is about 444.7620610740.

The spelling of 87979847 in words is "eighty-seven million, nine hundred seventy-nine thousand, eight hundred forty-seven".