87624389 has 2 divisors, whose sum is σ = 87624390. Its totient is φ = 87624388.

The previous prime is 87624379. The next prime is 87624391. The reversal of 87624389 is 98342678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75777025 + 11847364 = 8705^2 + 3442^2 .

It is a cyclic number.

It is not a de Polignac number, because 87624389 - 2⁴ = 87624373 is a prime.

Together with 87624391, 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 (87624359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43812194 + 43812195.

It is an arithmetic number, because the mean of its divisors is an integer number (43812195).

Almost surely, 2^87624389 is an apocalyptic number.

It is an amenable number.

87624389 is a deficient number, since it is larger than the sum of its proper divisors (1).

87624389 is an equidigital number, since it uses as much as digits as its factorization.

87624389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 47.

The square root of 87624389 is about 9360.7899773470. The cubic root of 87624389 is about 444.1622736259.

The spelling of 87624389 in words is "eighty-seven million, six hundred twenty-four thousand, three hundred eighty-nine".