71209380 has 96 divisors (see below), whose sum is σ = 227017728. Its totient is φ = 16508800.

The previous prime is 71209363. The next prime is 71209381. The reversal of 71209380 is 8390217.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (71209381) 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, 12835 + ... + 17525.

It is an arithmetic number, because the mean of its divisors is an integer number (2364768).

Almost surely, 2^71209380 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 71209380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113508864).

71209380 is an abundant number, since it is smaller than the sum of its proper divisors (155808348).

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

71209380 is a wasteful number, since it uses less digits than its factorization.

71209380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4737 (or 4735 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 71209380 is about 8438.5650438922. The cubic root of 71209380 is about 414.4884197989.

Adding to 71209380 its reverse (8390217), we get a palindrome (79599597).

The spelling of 71209380 in words is "seventy-one million, two hundred nine thousand, three hundred eighty".