71521430 has 8 divisors (see below), whose sum is σ = 128738592. Its totient is φ = 28608568.

The previous prime is 71521423. The next prime is 71521459. The reversal of 71521430 is 3412517.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 71521396 and 71521405.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576062 + ... + 3576081.

It is an arithmetic number, because the mean of its divisors is an integer number (16092324).

Almost surely, 2^71521430 is an apocalyptic number.

71521430 is a deficient number, since it is larger than the sum of its proper divisors (57217162).

71521430 is a wasteful number, since it uses less digits than its factorization.

71521430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7152150.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 71521430 is about 8457.0343501726. The cubic root of 71521430 is about 415.0929873404.

Adding to 71521430 its reverse (3412517), we get a palindrome (74933947).

The spelling of 71521430 in words is "seventy-one million, five hundred twenty-one thousand, four hundred thirty".