87788521 has 2 divisors, whose sum is σ = 87788522. Its totient is φ = 87788520.

The previous prime is 87788501. The next prime is 87788537. The reversal of 87788521 is 12588778.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78854400 + 8934121 = 8880^2 + 2989^2 .

It is a cyclic number.

It is not a de Polignac number, because 87788521 - 2⁵ = 87788489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87788501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43894260 + 43894261.

It is an arithmetic number, because the mean of its divisors is an integer number (43894261).

Almost surely, 2^87788521 is an apocalyptic number.

It is an amenable number.

87788521 is a deficient number, since it is larger than the sum of its proper divisors (1).

87788521 is an equidigital number, since it uses as much as digits as its factorization.

87788521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 250880, while the sum is 46.

The square root of 87788521 is about 9369.5528708685. The cubic root of 87788521 is about 444.4394254271.

It can be divided in two parts, 877 and 88521, that added together give a palindrome (89398).

The spelling of 87788521 in words is "eighty-seven million, seven hundred eighty-eight thousand, five hundred twenty-one".