71539780 has 24 divisors (see below), whose sum is σ = 161790552. Its totient is φ = 26414592.

The previous prime is 71539739. The next prime is 71539837. The reversal of 71539780 is 8793517.

It can be written as a sum of positive squares in 4 ways, for example, as 3378244 + 68161536 = 1838^2 + 8256^2 .

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, 137317 + ... + 137836.

It is an arithmetic number, because the mean of its divisors is an integer number (6741273).

Almost surely, 2^71539780 is an apocalyptic number.

It is an amenable number.

71539780 is an abundant number, since it is smaller than the sum of its proper divisors (90250772).

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

71539780 is a wasteful number, since it uses less digits than its factorization.

71539780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275175 (or 275173 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 71539780 is about 8458.1191762708. The cubic root of 71539780 is about 415.1284839508.

The spelling of 71539780 in words is "seventy-one million, five hundred thirty-nine thousand, seven hundred eighty".