71890087 has 4 divisors (see below), whose sum is σ = 72149896. Its totient is φ = 71630280.

The previous prime is 71890069. The next prime is 71890099. The reversal of 71890087 is 78009817.

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 71890087 - 2¹⁹ = 71365799 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 (71890057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129489 + ... + 130042.

It is an arithmetic number, because the mean of its divisors is an integer number (18037474).

Almost surely, 2^71890087 is an apocalyptic number.

71890087 is a deficient number, since it is larger than the sum of its proper divisors (259809).

71890087 is a wasteful number, since it uses less digits than its factorization.

71890087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259808.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 71890087 is about 8478.8022149358. The cubic root of 71890087 is about 415.8049639706.

The spelling of 71890087 in words is "seventy-one million, eight hundred ninety thousand, eighty-seven".