87271906 has 4 divisors (see below), whose sum is σ = 130907862. Its totient is φ = 43635952.

The previous prime is 87271901. The next prime is 87271909. The reversal of 87271906 is 60917278.

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

It can be written as a sum of positive squares in only one way, i.e., 86769225 + 502681 = 9315^2 + 709^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (87271901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21817975 + ... + 21817978.

Almost surely, 2^87271906 is an apocalyptic number.

87271906 is a deficient number, since it is larger than the sum of its proper divisors (43635956).

87271906 is a wasteful number, since it uses less digits than its factorization.

87271906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43635955.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 87271906 is about 9341.9433738382. The cubic root of 87271906 is about 443.5659021834.

Subtracting from 87271906 its sum of digits (40), we obtain a triangular number (87271866 = T₁₃₂₁₁).

The spelling of 87271906 in words is "eighty-seven million, two hundred seventy-one thousand, nine hundred six".