87630421 has 2 divisors, whose sum is σ = 87630422. Its totient is φ = 87630420.

The previous prime is 87630377. The next prime is 87630449. The reversal of 87630421 is 12403678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69906321 + 17724100 = 8361^2 + 4210^2 .

It is a cyclic number.

It is not a de Polignac number, because 87630421 - 2¹³ = 87622229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87631421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43815210 + 43815211.

It is an arithmetic number, because the mean of its divisors is an integer number (43815211).

Almost surely, 2^87630421 is an apocalyptic number.

It is an amenable number.

87630421 is a deficient number, since it is larger than the sum of its proper divisors (1).

87630421 is an equidigital number, since it uses as much as digits as its factorization.

87630421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 87630421 is about 9361.1121668315. The cubic root of 87630421 is about 444.1724653293.

The spelling of 87630421 in words is "eighty-seven million, six hundred thirty thousand, four hundred twenty-one".