71421904 has 20 divisors (see below), whose sum is σ = 138510976. Its totient is φ = 35677152.

The previous prime is 71421881. The next prime is 71421929. The reversal of 71421904 is 40912417.

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, 32257 + ... + 34399.

Almost surely, 2^71421904 is an apocalyptic number.

It is an amenable number.

71421904 is a deficient number, since it is larger than the sum of its proper divisors (67089072).

71421904 is a wasteful number, since it uses less digits than its factorization.

71421904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4234 (or 4228 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 71421904 is about 8451.1480876861. The cubic root of 71421904 is about 414.9003563934.

The spelling of 71421904 in words is "seventy-one million, four hundred twenty-one thousand, nine hundred four".