71428860 has 72 divisors (see below), whose sum is σ = 218954736. Its totient is φ = 18846720.

The previous prime is 71428853. The next prime is 71428871. The reversal of 71428860 is 6882417.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15415 + ... + 19505.

It is an arithmetic number, because the mean of its divisors is an integer number (3041038).

Almost surely, 2^71428860 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71428860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109477368).

71428860 is an abundant number, since it is smaller than the sum of its proper divisors (147525876).

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

71428860 is a wasteful number, since it uses less digits than its factorization.

71428860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203 (or 4198 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 71428860 is about 8451.5596193839. The cubic root of 71428860 is about 414.9138254322.

The spelling of 71428860 in words is "seventy-one million, four hundred twenty-eight thousand, eight hundred sixty".