71422440 has 128 divisors (see below), whose sum is σ = 229340160. Its totient is φ = 17731584.

The previous prime is 71422433. The next prime is 71422487. The reversal of 71422440 is 4422417.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 71422440.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 320169 + ... + 320391.

It is an arithmetic number, because the mean of its divisors is an integer number (1791720).

Almost surely, 2^71422440 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 71422440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114670080).

71422440 is an abundant number, since it is smaller than the sum of its proper divisors (157917720).

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

71422440 is a wasteful number, since it uses less digits than its factorization.

71422440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411 (or 407 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 24.

The square root of 71422440 is about 8451.1797992943. The cubic root of 71422440 is about 414.9013942918.

Adding to 71422440 its reverse (4422417), we get a palindrome (75844857).

The spelling of 71422440 in words is "seventy-one million, four hundred twenty-two thousand, four hundred forty".