71457220 has 24 divisors (see below), whose sum is σ = 150393600. Its totient is φ = 28519392.

The previous prime is 71457209. The next prime is 71457241. The reversal of 71457220 is 2275417.

It is a super-2 number, since 2×71457220² = 10212268580256800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5851 + ... + 13309.

It is an arithmetic number, because the mean of its divisors is an integer number (6266400).

Almost surely, 2^71457220 is an apocalyptic number.

It is an amenable number.

71457220 is an abundant number, since it is smaller than the sum of its proper divisors (78936380).

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

71457220 is a wasteful number, since it uses less digits than its factorization.

71457220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7947 (or 7945 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 71457220 is about 8453.2372497168. The cubic root of 71457220 is about 414.9687304063.

It can be divided in two parts, 7145 and 7220, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 71457220 in words is "seventy-one million, four hundred fifty-seven thousand, two hundred twenty".