71428520 has 16 divisors (see below), whose sum is σ = 160714260. Its totient is φ = 28571392.

The previous prime is 71428517. The next prime is 71428531. The reversal of 71428520 is 2582417.

It can be written as a sum of positive squares in 2 ways, for example, as 70930084 + 498436 = 8422^2 + 706^2 .

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, 892817 + ... + 892896.

Almost surely, 2^71428520 is an apocalyptic number.

It is an amenable number.

71428520 is an abundant number, since it is smaller than the sum of its proper divisors (89285740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71428520 is a wasteful number, since it uses less digits than its factorization.

71428520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785724 (or 1785720 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 71428520 is about 8451.5395047293. The cubic root of 71428520 is about 414.9131671039.

The spelling of 71428520 in words is "seventy-one million, four hundred twenty-eight thousand, five hundred twenty".