71709390 has 48 divisors (see below), whose sum is σ = 186870528. Its totient is φ = 19078848.

The previous prime is 71709389. The next prime is 71709397. The reversal of 71709390 is 9390717.

It is a super-2 number, since 2×71709390² = 10284473228344200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71709397) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65427 + ... + 66513.

It is an arithmetic number, because the mean of its divisors is an integer number (3893136).

Almost surely, 2^71709390 is an apocalyptic number.

71709390 is an abundant number, since it is smaller than the sum of its proper divisors (115161138).

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

71709390 is a wasteful number, since it uses less digits than its factorization.

71709390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1833 (or 1830 counting only the distinct ones).

The product of its (nonzero) digits is 11907, while the sum is 36.

The square root of 71709390 is about 8468.1397012567. The cubic root of 71709390 is about 415.4562939774.

The spelling of 71709390 in words is "seventy-one million, seven hundred nine thousand, three hundred ninety".