71836240 has 80 divisors (see below), whose sum is σ = 196094592. Its totient is φ = 23956992.

The previous prime is 71836211. The next prime is 71836249. The reversal of 71836240 is 4263817.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71836249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18987 + ... + 22453.

Almost surely, 2^71836240 is an apocalyptic number.

71836240 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 71836240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98047296).

71836240 is an abundant number, since it is smaller than the sum of its proper divisors (124258352).

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

71836240 is a wasteful number, since it uses less digits than its factorization.

71836240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524 (or 3518 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 71836240 is about 8475.6262305508. The cubic root of 71836240 is about 415.7011228464.

The spelling of 71836240 in words is "seventy-one million, eight hundred thirty-six thousand, two hundred forty".