87989723 has 2 divisors, whose sum is σ = 87989724. Its totient is φ = 87989722.

The previous prime is 87989719. The next prime is 87989809. The reversal of 87989723 is 32798978.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87989723 - 2² = 87989719 is a prime.

It is not a weakly prime, because it can be changed into another prime (87989623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43994861 + 43994862.

It is an arithmetic number, because the mean of its divisors is an integer number (43994862).

Almost surely, 2^87989723 is an apocalyptic number.

87989723 is a deficient number, since it is larger than the sum of its proper divisors (1).

87989723 is an equidigital number, since it uses as much as digits as its factorization.

87989723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 53.

The square root of 87989723 is about 9380.2837377128. The cubic root of 87989723 is about 444.7787024069.

The spelling of 87989723 in words is "eighty-seven million, nine hundred eighty-nine thousand, seven hundred twenty-three".