87138197 has 8 divisors (see below), whose sum is σ = 88465080. Its totient is φ = 85821120.

The previous prime is 87138193. The next prime is 87138203. The reversal of 87138197 is 79183178.

It can be written as a sum of positive squares in 4 ways, for example, as 33570436 + 53567761 = 5794^2 + 7319^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87138197 - 2² = 87138193 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 (87138193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16547 + ... + 21167.

It is an arithmetic number, because the mean of its divisors is an integer number (11058135).

Almost surely, 2^87138197 is an apocalyptic number.

It is an amenable number.

87138197 is a deficient number, since it is larger than the sum of its proper divisors (1326883).

87138197 is a wasteful number, since it uses less digits than its factorization.

87138197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4903.

The product of its digits is 84672, while the sum is 44.

The square root of 87138197 is about 9334.7842503188. The cubic root of 87138197 is about 443.3392577772.

The spelling of 87138197 in words is "eighty-seven million, one hundred thirty-eight thousand, one hundred ninety-seven".