71987244 has 48 divisors (see below), whose sum is σ = 192611328. Its totient is φ = 20498688.

The previous prime is 71987243. The next prime is 71987273. The reversal of 71987244 is 44278917.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 71987196 and 71987205.

It is not an unprimeable number, because it can be changed into a prime (71987243) 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, 27037 + ... + 29579.

It is an arithmetic number, because the mean of its divisors is an integer number (4012736).

Almost surely, 2^71987244 is an apocalyptic number.

It is an amenable number.

71987244 is an abundant number, since it is smaller than the sum of its proper divisors (120624084).

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

71987244 is a wasteful number, since it uses less digits than its factorization.

71987244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2894 (or 2892 counting only the distinct ones).

The product of its digits is 112896, while the sum is 42.

The square root of 71987244 is about 8484.5296864352. The cubic root of 71987244 is about 415.9921950582.

The spelling of 71987244 in words is "seventy-one million, nine hundred eighty-seven thousand, two hundred forty-four".