71530815 has 16 divisors (see below), whose sum is σ = 121182048. Its totient is φ = 35905536.

The previous prime is 71530793. The next prime is 71530831. The reversal of 71530815 is 51803517.

It is not a de Polignac number, because 71530815 - 2¹¹ = 71528767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140002 + ... + 140511.

It is an arithmetic number, because the mean of its divisors is an integer number (7573878).

Almost surely, 2^71530815 is an apocalyptic number.

71530815 is a deficient number, since it is larger than the sum of its proper divisors (49651233).

71530815 is a wasteful number, since it uses less digits than its factorization.

71530815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280538.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 71530815 is about 8457.5891955096. The cubic root of 71530815 is about 415.1111426323. Note that the first 4 decimals are identical.

The spelling of 71530815 in words is "seventy-one million, five hundred thirty thousand, eight hundred fifteen".