87679621 has 2 divisors, whose sum is σ = 87679622. Its totient is φ = 87679620.

The previous prime is 87679609. The next prime is 87679637. The reversal of 87679621 is 12697678.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82901025 + 4778596 = 9105^2 + 2186^2 .

It is a cyclic number.

It is not a de Polignac number, because 87679621 - 2¹⁹ = 87155333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87679601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43839810 + 43839811.

It is an arithmetic number, because the mean of its divisors is an integer number (43839811).

Almost surely, 2^87679621 is an apocalyptic number.

It is an amenable number.

87679621 is a deficient number, since it is larger than the sum of its proper divisors (1).

87679621 is an equidigital number, since it uses as much as digits as its factorization.

87679621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 87679621 is about 9363.7396909568. The cubic root of 87679621 is about 444.2555764852.

The spelling of 87679621 in words is "eighty-seven million, six hundred seventy-nine thousand, six hundred twenty-one".