71238815 has 4 divisors (see below), whose sum is σ = 85486584. Its totient is φ = 56991048.

The previous prime is 71238787. The next prime is 71238821. The reversal of 71238815 is 51883217.

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 71238815 - 2¹² = 71234719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7123877 + ... + 7123886.

It is an arithmetic number, because the mean of its divisors is an integer number (21371646).

Almost surely, 2^71238815 is an apocalyptic number.

71238815 is a deficient number, since it is larger than the sum of its proper divisors (14247769).

71238815 is a wasteful number, since it uses less digits than its factorization.

71238815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14247768.

The product of its digits is 13440, while the sum is 35.

The square root of 71238815 is about 8440.3089398434. The cubic root of 71238815 is about 414.5455226972.

The spelling of 71238815 in words is "seventy-one million, two hundred thirty-eight thousand, eight hundred fifteen".