87764321 has 2 divisors, whose sum is σ = 87764322. Its totient is φ = 87764320.

The previous prime is 87764291. The next prime is 87764351. The reversal of 87764321 is 12346778.

It is a balanced prime because it is at equal distance from previous prime (87764291) and next prime (87764351).

It can be written as a sum of positive squares in only one way, i.e., 63123025 + 24641296 = 7945^2 + 4964^2 .

It is a cyclic number.

It is not a de Polignac number, because 87764321 - 2²⁶ = 20655457 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (87764351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43882160 + 43882161.

It is an arithmetic number, because the mean of its divisors is an integer number (43882161).

Almost surely, 2^87764321 is an apocalyptic number.

It is an amenable number.

87764321 is a deficient number, since it is larger than the sum of its proper divisors (1).

87764321 is an equidigital number, since it uses as much as digits as its factorization.

87764321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 38.

The square root of 87764321 is about 9368.2613648425. The cubic root of 87764321 is about 444.3985832516.

The spelling of 87764321 in words is "eighty-seven million, seven hundred sixty-four thousand, three hundred twenty-one".