71549240 has 64 divisors (see below), whose sum is σ = 189941760. Its totient is φ = 23736960.

The previous prime is 71549221. The next prime is 71549249. The reversal of 71549240 is 4294517.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 71549197 and 71549206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71549249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4559 + ... + 12801.

It is an arithmetic number, because the mean of its divisors is an integer number (2967840).

Almost surely, 2^71549240 is an apocalyptic number.

71549240 is a gapful number since it is divisible by the number (70) 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 71549240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94970880).

71549240 is an abundant number, since it is smaller than the sum of its proper divisors (118392520).

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

71549240 is a wasteful number, since it uses less digits than its factorization.

71549240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8292 (or 8288 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 71549240 is about 8458.6783837666. The cubic root of 71549240 is about 415.1467811945.

The spelling of 71549240 in words is "seventy-one million, five hundred forty-nine thousand, two hundred forty".