71220044 has 12 divisors (see below), whose sum is σ = 142440144. Its totient is φ = 30522864.

The previous prime is 71220043. The next prime is 71220047. The reversal of 71220044 is 44002217.

71220044 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 71219998 and 71220025.

It is not an unprimeable number, because it can be changed into a prime (71220043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1271759 + ... + 1271814.

It is an arithmetic number, because the mean of its divisors is an integer number (11870012).

Almost surely, 2^71220044 is an apocalyptic number.

It is an amenable number.

71220044 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

71220044 is a wasteful number, since it uses less digits than its factorization.

71220044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543584 (or 2543582 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 71220044 is about 8439.1968812204. The cubic root of 71220044 is about 414.5091094135.

The spelling of 71220044 in words is "seventy-one million, two hundred twenty thousand, forty-four".