71721460 has 12 divisors (see below), whose sum is σ = 150615108. Its totient is φ = 28688576.

The previous prime is 71721373. The next prime is 71721491. The reversal of 71721460 is 6412717.

It can be written as a sum of positive squares in 2 ways, for example, as 21566736 + 50154724 = 4644^2 + 7082^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1793017 + ... + 1793056.

It is an arithmetic number, because the mean of its divisors is an integer number (12551259).

Almost surely, 2^71721460 is an apocalyptic number.

It is an amenable number.

71721460 is an abundant number, since it is smaller than the sum of its proper divisors (78893648).

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

71721460 is a wasteful number, since it uses less digits than its factorization.

71721460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3586082 (or 3586080 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 71721460 is about 8468.8523425550. The cubic root of 71721460 is about 415.4796022970.

The spelling of 71721460 in words is "seventy-one million, seven hundred twenty-one thousand, four hundred sixty".