87630661 has 2 divisors, whose sum is σ = 87630662. Its totient is φ = 87630660.

The previous prime is 87630629. The next prime is 87630691. The reversal of 87630661 is 16603678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60746436 + 26884225 = 7794^2 + 5185^2 .

It is a cyclic number.

It is not a de Polignac number, because 87630661 - 2⁵ = 87630629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87630661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87630611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43815330 + 43815331.

It is an arithmetic number, because the mean of its divisors is an integer number (43815331).

Almost surely, 2^87630661 is an apocalyptic number.

It is an amenable number.

87630661 is a deficient number, since it is larger than the sum of its proper divisors (1).

87630661 is an equidigital number, since it uses as much as digits as its factorization.

87630661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 87630661 is about 9361.1249858123. The cubic root of 87630661 is about 444.1728708251.

The spelling of 87630661 in words is "eighty-seven million, six hundred thirty thousand, six hundred sixty-one".