71028720 has 240 divisors, whose sum is σ = 288999360. Its totient is φ = 15261696.

The previous prime is 71028709. The next prime is 71028731. The reversal of 71028720 is 2782017.

It is an interprime number because it is at equal distance from previous prime (71028709) and next prime (71028731).

It is a tau number, because it is divible by the number of its divisors (240).

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, 85266 + ... + 86094.

It is an arithmetic number, because the mean of its divisors is an integer number (1204164).

Almost surely, 2^71028720 is an apocalyptic number.

71028720 is a gapful number since it is divisible by the number (70) 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 71028720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144499680).

71028720 is an abundant number, since it is smaller than the sum of its proper divisors (217970640).

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

71028720 is a wasteful number, since it uses less digits than its factorization.

71028720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 71028720 is about 8427.8538193303. The cubic root of 71028720 is about 414.1376004137.

The spelling of 71028720 in words is "seventy-one million, twenty-eight thousand, seven hundred twenty".