87691207 has 2 divisors, whose sum is σ = 87691208. Its totient is φ = 87691206.

The previous prime is 87691193. The next prime is 87691217. The reversal of 87691207 is 70219678.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87691207 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87691207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87691217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43845603 + 43845604.

It is an arithmetic number, because the mean of its divisors is an integer number (43845604).

Almost surely, 2^87691207 is an apocalyptic number.

87691207 is a deficient number, since it is larger than the sum of its proper divisors (1).

87691207 is an equidigital number, since it uses as much as digits as its factorization.

87691207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 87691207 is about 9364.3583335966. The cubic root of 87691207 is about 444.2751436258.

The spelling of 87691207 in words is "eighty-seven million, six hundred ninety-one thousand, two hundred seven".