71511420 has 48 divisors (see below), whose sum is σ = 206696448. Its totient is φ = 18454080.

The previous prime is 71511373. The next prime is 71511431. The reversal of 71511420 is 2411517.

It is a happy number.

It is a super-2 number, since 2×71511420² = 10227766380832800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17364 + ... + 21083.

It is an arithmetic number, because the mean of its divisors is an integer number (4306176).

Almost surely, 2^71511420 is an apocalyptic number.

It is an amenable number.

71511420 is an abundant number, since it is smaller than the sum of its proper divisors (135185028).

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

71511420 is a wasteful number, since it uses less digits than its factorization.

71511420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38490 (or 38488 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 21.

The square root of 71511420 is about 8456.4425144383. The cubic root of 71511420 is about 415.0736212350.

Adding to 71511420 its reverse (2411517), we get a palindrome (73922937).

The spelling of 71511420 in words is "seventy-one million, five hundred eleven thousand, four hundred twenty".