81069252 has 48 divisors (see below), whose sum is σ = 206976000. Its totient is φ = 24492960.

The previous prime is 81069223. The next prime is 81069253. The reversal of 81069252 is 25296018.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81069253) 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, 57249 + ... + 58647.

It is an arithmetic number, because the mean of its divisors is an integer number (4312000).

Almost surely, 2^81069252 is an apocalyptic number.

It is an amenable number.

81069252 is an abundant number, since it is smaller than the sum of its proper divisors (125906748).

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

81069252 is a wasteful number, since it uses less digits than its factorization.

81069252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856 (or 1854 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 81069252 is about 9003.8465113528. The cubic root of 81069252 is about 432.7981429645.

The spelling of 81069252 in words is "eighty-one million, sixty-nine thousand, two hundred fifty-two".