71188428 has 12 divisors (see below), whose sum is σ = 166106360. Its totient is φ = 23729472.

The previous prime is 71188391. The next prime is 71188463. The reversal of 71188428 is 82488117.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×71188428² = 10135584562222368, which contains 22 as substring.

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, 2966173 + ... + 2966196.

Almost surely, 2^71188428 is an apocalyptic number.

It is an amenable number.

71188428 is an abundant number, since it is smaller than the sum of its proper divisors (94917932).

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

71188428 is a wasteful number, since it uses less digits than its factorization.

71188428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5932376 (or 5932374 counting only the distinct ones).

The product of its digits is 28672, while the sum is 39.

The square root of 71188428 is about 8437.3235092652. The cubic root of 71188428 is about 414.4477640442.

The spelling of 71188428 in words is "seventy-one million, one hundred eighty-eight thousand, four hundred twenty-eight".