71538820 has 12 divisors (see below), whose sum is σ = 150231564. Its totient is φ = 28615520.

The previous prime is 71538811. The next prime is 71538821. The reversal of 71538820 is 2883517.

It can be written as a sum of positive squares in 2 ways, for example, as 52301824 + 19236996 = 7232^2 + 4386^2 .

It is not an unprimeable number, because it can be changed into a prime (71538821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1788451 + ... + 1788490.

It is an arithmetic number, because the mean of its divisors is an integer number (12519297).

Almost surely, 2^71538820 is an apocalyptic number.

It is an amenable number.

71538820 is an abundant number, since it is smaller than the sum of its proper divisors (78692744).

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

71538820 is a wasteful number, since it uses less digits than its factorization.

71538820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3576950 (or 3576948 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 71538820 is about 8458.0624258751. The cubic root of 71538820 is about 415.1266270579.

The spelling of 71538820 in words is "seventy-one million, five hundred thirty-eight thousand, eight hundred twenty".