71007420 has 96 divisors (see below), whose sum is σ = 218244096. Its totient is φ = 17107200.

The previous prime is 71007407. The next prime is 71007451. The reversal of 71007420 is 2470017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 178662 + ... + 179058.

It is an arithmetic number, because the mean of its divisors is an integer number (2273376).

Almost surely, 2^71007420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71007420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109122048).

71007420 is an abundant number, since it is smaller than the sum of its proper divisors (147236676).

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

71007420 is a wasteful number, since it uses less digits than its factorization.

71007420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 71007420 is about 8426.5900576686. The cubic root of 71007420 is about 414.0961992603.

Adding to 71007420 its reverse (2470017), we get a palindrome (73477437).

The spelling of 71007420 in words is "seventy-one million, seven thousand, four hundred twenty".