87999997 has 2 divisors, whose sum is σ = 87999998. Its totient is φ = 87999996.

The previous prime is 87999971. The next prime is 88000009. The reversal of 87999997 is 79999978.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87497316 + 502681 = 9354^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 87999997 - 2⁷ = 87999869 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 (87999397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43999998 + 43999999.

It is an arithmetic number, because the mean of its divisors is an integer number (43999999).

Almost surely, 2^87999997 is an apocalyptic number.

It is an amenable number.

87999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

87999997 is an equidigital number, since it uses as much as digits as its factorization.

87999997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23147208, while the sum is 67.

The square root of 87999997 is about 9380.8313597463. The cubic root of 87999997 is about 444.7960130594.

The spelling of 87999997 in words is "eighty-seven million, nine hundred ninety-nine thousand, nine hundred ninety-seven".