87207661 has 2 divisors, whose sum is σ = 87207662. Its totient is φ = 87207660.

The previous prime is 87207649. The next prime is 87207677. The reversal of 87207661 is 16670278.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 35640900 = 7181^2 + 5970^2 .

It is a cyclic number.

It is not a de Polignac number, because 87207661 - 2⁹ = 87207149 is a prime.

It is a super-2 number, since 2×87207661² = 15210352274181842, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87207661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87207361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43603830 + 43603831.

It is an arithmetic number, because the mean of its divisors is an integer number (43603831).

Almost surely, 2^87207661 is an apocalyptic number.

It is an amenable number.

87207661 is a deficient number, since it is larger than the sum of its proper divisors (1).

87207661 is an equidigital number, since it uses as much as digits as its factorization.

87207661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 87207661 is about 9338.5042164150. The cubic root of 87207661 is about 443.4570321465.

The spelling of 87207661 in words is "eighty-seven million, two hundred seven thousand, six hundred sixty-one".