87721367 has 2 divisors, whose sum is σ = 87721368. Its totient is φ = 87721366.

The previous prime is 87721357. The next prime is 87721391. The reversal of 87721367 is 76312778.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87721367 - 2⁶ = 87721303 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87721357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43860683 + 43860684.

It is an arithmetic number, because the mean of its divisors is an integer number (43860684).

Almost surely, 2^87721367 is an apocalyptic number.

87721367 is a deficient number, since it is larger than the sum of its proper divisors (1).

87721367 is an equidigital number, since it uses as much as digits as its factorization.

87721367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 98784, while the sum is 41.

The square root of 87721367 is about 9365.9685564281. The cubic root of 87721367 is about 444.3260715843.

It can be divided in two parts, 87721 and 367, that added together give a palindrome (88088).

The spelling of 87721367 in words is "eighty-seven million, seven hundred twenty-one thousand, three hundred sixty-seven".