71099028 has 144 divisors (see below), whose sum is σ = 241428096. Its totient is φ = 17038080.

The previous prime is 71099011. The next prime is 71099047. The reversal of 71099028 is 82099017.

It is a happy number.

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 = 71098983 and 71099001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 35050 + ... + 37022.

It is an arithmetic number, because the mean of its divisors is an integer number (1676584).

Almost surely, 2^71099028 is an apocalyptic number.

71099028 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 71099028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120714048).

71099028 is an abundant number, since it is smaller than the sum of its proper divisors (170329068).

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

71099028 is a wasteful number, since it uses less digits than its factorization.

71099028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014 (or 2009 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 71099028 is about 8432.0239563227. The cubic root of 71099028 is about 414.2742004840.

The spelling of 71099028 in words is "seventy-one million, ninety-nine thousand, twenty-eight".