87971047 has 4 divisors (see below), whose sum is σ = 88365760. Its totient is φ = 87576336.

The previous prime is 87971041. The next prime is 87971057. The reversal of 87971047 is 74017978.

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

It is a cyclic number.

It is not a de Polignac number, because 87971047 - 2⁷ = 87970919 is a prime.

It is a super-2 number, since 2×87971047² = 15477810220552418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 87970994 and 87971012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87971041) 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, 197022 + ... + 197467.

It is an arithmetic number, because the mean of its divisors is an integer number (22091440).

Almost surely, 2^87971047 is an apocalyptic number.

87971047 is a deficient number, since it is larger than the sum of its proper divisors (394713).

87971047 is a wasteful number, since it uses less digits than its factorization.

87971047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394712.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 87971047 is about 9379.2881926082. The cubic root of 87971047 is about 444.7472317816.

The spelling of 87971047 in words is "eighty-seven million, nine hundred seventy-one thousand, forty-seven".