71684028 has 168 divisors, whose sum is σ = 212514176. Its totient is φ = 20995200.

The previous prime is 71684023. The next prime is 71684051. The reversal of 71684028 is 82048617.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 71683983 and 71684001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71684021) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1175118 + ... + 1175178.

Almost surely, 2^71684028 is an apocalyptic number.

71684028 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71684028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106257088).

71684028 is an abundant number, since it is smaller than the sum of its proper divisors (140830148).

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

71684028 is a wasteful number, since it uses less digits than its factorization.

71684028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127 (or 110 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 71684028 is about 8466.6420734551. The cubic root of 71684028 is about 415.4073090166.

The spelling of 71684028 in words is "seventy-one million, six hundred eighty-four thousand, twenty-eight".