71523887 has 4 divisors (see below), whose sum is σ = 71594160. Its totient is φ = 71453616.

The previous prime is 71523877. The next prime is 71523899. The reversal of 71523887 is 78832517.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78832517 = 167 ⋅472051.

It is a cyclic number.

It is not a de Polignac number, because 71523887 - 2¹⁶ = 71458351 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 (71523817) 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, 33587 + ... + 35652.

It is an arithmetic number, because the mean of its divisors is an integer number (17898540).

Almost surely, 2^71523887 is an apocalyptic number.

71523887 is a deficient number, since it is larger than the sum of its proper divisors (70273).

71523887 is a wasteful number, since it uses less digits than its factorization.

71523887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70272.

The product of its digits is 94080, while the sum is 41.

The square root of 71523887 is about 8457.1796126132. The cubic root of 71523887 is about 415.0977405628.

The spelling of 71523887 in words is "seventy-one million, five hundred twenty-three thousand, eight hundred eighty-seven".