71354440 has 32 divisors (see below), whose sum is σ = 169993080. Its totient is φ = 26862592.

The previous prime is 71354431. The next prime is 71354447. The reversal of 71354440 is 4445317.

It can be written as a sum of positive squares in 4 ways, for example, as 64032004 + 7322436 = 8002^2 + 2706^2 .

It is a super-2 number, since 2×71354440² = 10182912215427200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71354399 and 71354408.

It is not an unprimeable number, because it can be changed into a prime (71354447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51787 + ... + 53146.

Almost surely, 2^71354440 is an apocalyptic number.

It is an amenable number.

71354440 is an abundant number, since it is smaller than the sum of its proper divisors (98638640).

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

71354440 is a wasteful number, since it uses less digits than its factorization.

71354440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104961 (or 104957 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 71354440 is about 8447.1557343286. The cubic root of 71354440 is about 414.7696791365.

Adding to 71354440 its reverse (4445317), we get a palindrome (75799757).

The spelling of 71354440 in words is "seventy-one million, three hundred fifty-four thousand, four hundred forty".