71386428 has 24 divisors (see below), whose sum is σ = 171942400. Its totient is φ = 23027760.

The previous prime is 71386387. The next prime is 71386433. The reversal of 71386428 is 82468317.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95578 + ... + 96321.

Almost surely, 2^71386428 is an apocalyptic number.

It is an amenable number.

71386428 is an abundant number, since it is smaller than the sum of its proper divisors (100555972).

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

71386428 is a wasteful number, since it uses less digits than its factorization.

71386428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191937 (or 191935 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 71386428 is about 8449.0489405613. The cubic root of 71386428 is about 414.8316499140.

The spelling of 71386428 in words is "seventy-one million, three hundred eighty-six thousand, four hundred twenty-eight".