71671520 has 48 divisors (see below), whose sum is σ = 171007200. Its totient is φ = 28383744.

The previous prime is 71671517. The next prime is 71671547. The reversal of 71671520 is 2517617.

It is a super-2 number, since 2×71671520² = 10273613558220800, which contains 22 as substring.

It is a congruent number.

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, 14306 + ... + 18654.

It is an arithmetic number, because the mean of its divisors is an integer number (3562650).

Almost surely, 2^71671520 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 71671520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85503600).

71671520 is an abundant number, since it is smaller than the sum of its proper divisors (99335680).

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

71671520 is a wasteful number, since it uses less digits than its factorization.

71671520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4467 (or 4459 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 71671520 is about 8465.9033776674. The cubic root of 71671520 is about 415.3831464195.

The spelling of 71671520 in words is "seventy-one million, six hundred seventy-one thousand, five hundred twenty".