71722540 has 24 divisors (see below), whose sum is σ = 151058880. Its totient is φ = 28604928.

The previous prime is 71722531. The next prime is 71722543. The reversal of 71722540 is 4522717.

It is a junction number, because it is equal to n+sod(n) for n = 71722499 and 71722508.

It is not an unprimeable number, because it can be changed into a prime (71722543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1981 + ... + 12139.

It is an arithmetic number, because the mean of its divisors is an integer number (6294120).

Almost surely, 2^71722540 is an apocalyptic number.

It is an amenable number.

71722540 is an abundant number, since it is smaller than the sum of its proper divisors (79336340).

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

71722540 is a wasteful number, since it uses less digits than its factorization.

71722540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10521 (or 10519 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 71722540 is about 8468.9161053821. The cubic root of 71722540 is about 415.4816877524.

The spelling of 71722540 in words is "seventy-one million, seven hundred twenty-two thousand, five hundred forty".