87799997 has 4 divisors (see below), whose sum is σ = 87825276. Its totient is φ = 87774720.

The previous prime is 87799991. The next prime is 87800003. The reversal of 87799997 is 79999778.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (87799991) and next prime (87800003).

It can be written as a sum of positive squares in 2 ways, for example, as 52504516 + 35295481 = 7246^2 + 5941^2 .

It is a cyclic number.

It is not a de Polignac number, because 87799997 - 2¹⁰ = 87798973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87799991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6404 + ... + 14717.

It is an arithmetic number, because the mean of its divisors is an integer number (21956319).

Almost surely, 2^87799997 is an apocalyptic number.

It is an amenable number.

87799997 is a deficient number, since it is larger than the sum of its proper divisors (25279).

87799997 is a wasteful number, since it uses less digits than its factorization.

87799997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25278.

The product of its digits is 18003384, while the sum is 65.

The square root of 87799997 is about 9370.1652600154. The cubic root of 87799997 is about 444.4587907707.

The spelling of 87799997 in words is "eighty-seven million, seven hundred ninety-nine thousand, nine hundred ninety-seven".