71728884 has 18 divisors (see below), whose sum is σ = 181314770. Its totient is φ = 23909616.

The previous prime is 71728879. The next prime is 71728913. The reversal of 71728884 is 48882717.

It can be written as a sum of positive squares in only one way, i.e., 61308900 + 10419984 = 7830^2 + 3228^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×71728884³ (a number of 25 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 996199 + ... + 996270.

Almost surely, 2^71728884 is an apocalyptic number.

It is an amenable number.

71728884 is an abundant number, since it is smaller than the sum of its proper divisors (109585886).

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

71728884 is a wasteful number, since it uses less digits than its factorization.

71728884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992479 (or 1992474 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 71728884 is about 8469.2906432593. The cubic root of 71728884 is about 415.4939374493.

The spelling of 71728884 in words is "seventy-one million, seven hundred twenty-eight thousand, eight hundred eighty-four".