71538428 has 12 divisors (see below), whose sum is σ = 134822520. Its totient is φ = 33017712.

The previous prime is 71538419. The next prime is 71538433. The reversal of 71538428 is 82483517.

It is a super-2 number, since 2×71538428² = 10235493361422368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71538391 and 71538400.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 687818 + ... + 687921.

It is an arithmetic number, because the mean of its divisors is an integer number (11235210).

Almost surely, 2^71538428 is an apocalyptic number.

It is an amenable number.

71538428 is a deficient number, since it is larger than the sum of its proper divisors (63284092).

71538428 is a wasteful number, since it uses less digits than its factorization.

71538428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375756 (or 1375754 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 71538428 is about 8458.0392526874. The cubic root of 71538428 is about 415.1258688218.

The spelling of 71538428 in words is "seventy-one million, five hundred thirty-eight thousand, four hundred twenty-eight".