71021928 has 32 divisors (see below), whose sum is σ = 183679200. Its totient is φ = 22857408.

The previous prime is 71021921. The next prime is 71021941. The reversal of 71021928 is 82912017.

It is a super-2 number, since 2×71021928² = 10088228513674368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 71021895 and 71021904.

It is not an unprimeable number, because it can be changed into a prime (71021921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50326 + ... + 51717.

It is an arithmetic number, because the mean of its divisors is an integer number (5739975).

Almost surely, 2^71021928 is an apocalyptic number.

It is an amenable number.

71021928 is an abundant number, since it is smaller than the sum of its proper divisors (112657272).

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

71021928 is a wasteful number, since it uses less digits than its factorization.

71021928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102081 (or 102077 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 71021928 is about 8427.4508601356. The cubic root of 71021928 is about 414.1243995928.

The spelling of 71021928 in words is "seventy-one million, twenty-one thousand, nine hundred twenty-eight".