87812897 has 4 divisors (see below), whose sum is σ = 88320660. Its totient is φ = 87305136.

The previous prime is 87812887. The next prime is 87812909. The reversal of 87812897 is 79821878.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55368481 + 32444416 = 7441^2 + 5696^2 .

It is a cyclic number.

It is not a de Polignac number, because 87812897 - 2²⁴ = 71035681 is a prime.

It is a super-2 number, since 2×87812897² = 15422209759065218, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87812887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253622 + ... + 253967.

It is an arithmetic number, because the mean of its divisors is an integer number (22080165).

Almost surely, 2^87812897 is an apocalyptic number.

It is an amenable number.

87812897 is a deficient number, since it is larger than the sum of its proper divisors (507763).

87812897 is a wasteful number, since it uses less digits than its factorization.

87812897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507762.

The product of its digits is 451584, while the sum is 50.

The square root of 87812897 is about 9370.8535897217. The cubic root of 87812897 is about 444.4805570494.

The spelling of 87812897 in words is "eighty-seven million, eight hundred twelve thousand, eight hundred ninety-seven".