81453252 has 12 divisors (see below), whose sum is σ = 190057616. Its totient is φ = 27151080.

The previous prime is 81453233. The next prime is 81453269. The reversal of 81453252 is 25235418.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×81453252² = 13269264522751008, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3393874 + ... + 3393897.

Almost surely, 2^81453252 is an apocalyptic number.

It is an amenable number.

81453252 is an abundant number, since it is smaller than the sum of its proper divisors (108604364).

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

81453252 is a wasteful number, since it uses less digits than its factorization.

81453252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6787778 (or 6787776 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

The square root of 81453252 is about 9025.1455389927. The cubic root of 81453252 is about 433.4804105615.

The spelling of 81453252 in words is "eighty-one million, four hundred fifty-three thousand, two hundred fifty-two".