81737252 has 12 divisors (see below), whose sum is σ = 143671920. Its totient is φ = 40688136.

The previous prime is 81737251. The next prime is 81737267. The reversal of 81737252 is 25273718.

It is not an unprimeable number, because it can be changed into a prime (81737251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44102 + ... + 45917.

It is an arithmetic number, because the mean of its divisors is an integer number (11972660).

Almost surely, 2^81737252 is an apocalyptic number.

It is an amenable number.

81737252 is a deficient number, since it is larger than the sum of its proper divisors (61934668).

81737252 is a wasteful number, since it uses less digits than its factorization.

81737252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90250 (or 90248 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 81737252 is about 9040.8656665167. The cubic root of 81737252 is about 433.9836261316.

The spelling of 81737252 in words is "eighty-one million, seven hundred thirty-seven thousand, two hundred fifty-two".