87607661 has 2 divisors, whose sum is σ = 87607662. Its totient is φ = 87607660.

The previous prime is 87607649. The next prime is 87607687. The reversal of 87607661 is 16670678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70879561 + 16728100 = 8419^2 + 4090^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87607661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87607361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43803830 + 43803831.

It is an arithmetic number, because the mean of its divisors is an integer number (43803831).

Almost surely, 2^87607661 is an apocalyptic number.

It is an amenable number.

87607661 is a deficient number, since it is larger than the sum of its proper divisors (1).

87607661 is an equidigital number, since it uses as much as digits as its factorization.

87607661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 87607661 is about 9359.8964203671. The cubic root of 87607661 is about 444.1340074492.

The spelling of 87607661 in words is "eighty-seven million, six hundred seven thousand, six hundred sixty-one".