87388321 has 2 divisors, whose sum is σ = 87388322. Its totient is φ = 87388320.

The previous prime is 87388307. The next prime is 87388387. The reversal of 87388321 is 12388378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 20802721 = 8160^2 + 4561^2 .

It is a cyclic number.

It is not a de Polignac number, because 87388321 - 2⁵ = 87388289 is a prime.

It is not a weakly prime, because it can be changed into another prime (87388621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43694160 + 43694161.

It is an arithmetic number, because the mean of its divisors is an integer number (43694161).

Almost surely, 2^87388321 is an apocalyptic number.

It is an amenable number.

87388321 is a deficient number, since it is larger than the sum of its proper divisors (1).

87388321 is an equidigital number, since it uses as much as digits as its factorization.

87388321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The square root of 87388321 is about 9348.1720673081. The cubic root of 87388321 is about 443.7630438274.

The spelling of 87388321 in words is "eighty-seven million, three hundred eighty-eight thousand, three hundred twenty-one".