71809608 has 128 divisors (see below), whose sum is σ = 203212800. Its totient is φ = 21002496.

The previous prime is 71809603. The next prime is 71809631. The reversal of 71809608 is 80690817.

It is a super-2 number, since 2×71809608² = 10313239602227328, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (71809601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 865135 + ... + 865217.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^71809608 is an apocalyptic number.

71809608 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71809608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101606400).

71809608 is an abundant number, since it is smaller than the sum of its proper divisors (131403192).

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

71809608 is a wasteful number, since it uses less digits than its factorization.

71809608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 39.

The square root of 71809608 is about 8474.0549915610. The cubic root of 71809608 is about 415.6497452469.

The spelling of 71809608 in words is "seventy-one million, eight hundred nine thousand, six hundred eight".