87639553 has 2 divisors, whose sum is σ = 87639554. Its totient is φ = 87639552.

The previous prime is 87639529. The next prime is 87639557. The reversal of 87639553 is 35593678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68690944 + 18948609 = 8288^2 + 4353^2 .

It is a cyclic number.

It is not a de Polignac number, because 87639553 - 2⁵ = 87639521 is a prime.

It is not a weakly prime, because it can be changed into another prime (87639557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43819776 + 43819777.

It is an arithmetic number, because the mean of its divisors is an integer number (43819777).

Almost surely, 2^87639553 is an apocalyptic number.

It is an amenable number.

87639553 is a deficient number, since it is larger than the sum of its proper divisors (1).

87639553 is an equidigital number, since it uses as much as digits as its factorization.

87639553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 46.

The square root of 87639553 is about 9361.5999166809. The cubic root of 87639553 is about 444.1878939214.

The spelling of 87639553 in words is "eighty-seven million, six hundred thirty-nine thousand, five hundred fifty-three".