71630428 has 6 divisors (see below), whose sum is σ = 125353256. Its totient is φ = 35815212.

The previous prime is 71630387. The next prime is 71630431. The reversal of 71630428 is 82403617.

It is a self number, because there is not a number n which added to its sum of digits gives 71630428.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8953800 + ... + 8953807.

Almost surely, 2^71630428 is an apocalyptic number.

It is an amenable number.

71630428 is a deficient number, since it is larger than the sum of its proper divisors (53722828).

71630428 is a wasteful number, since it uses less digits than its factorization.

71630428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17907611 (or 17907609 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 71630428 is about 8463.4761180026. The cubic root of 71630428 is about 415.3037462738.

The spelling of 71630428 in words is "seventy-one million, six hundred thirty thousand, four hundred twenty-eight".