71220642 has 16 divisors (see below), whose sum is σ = 145754400. Its totient is φ = 23188032.

The previous prime is 71220641. The next prime is 71220661. The reversal of 71220642 is 24602217.

It is not an unprimeable number, because it can be changed into a prime (71220641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137767 + ... + 138282.

It is an arithmetic number, because the mean of its divisors is an integer number (9109650).

Almost surely, 2^71220642 is an apocalyptic number.

71220642 is an abundant number, since it is smaller than the sum of its proper divisors (74533758).

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

71220642 is a wasteful number, since it uses less digits than its factorization.

71220642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276097.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 71220642 is about 8439.2323110577. The cubic root of 71220642 is about 414.5102695539.

Adding to 71220642 its reverse (24602217), we get a palindrome (95822859).

The spelling of 71220642 in words is "seventy-one million, two hundred twenty thousand, six hundred forty-two".