81336452 has 24 divisors (see below), whose sum is σ = 144074112. Its totient is φ = 40176000.

The previous prime is 81336443. The next prime is 81336509. The reversal of 81336452 is 25463318.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187628 + ... + 188060.

It is an arithmetic number, because the mean of its divisors is an integer number (6003088).

Almost surely, 2^81336452 is an apocalyptic number.

It is an amenable number.

81336452 is a deficient number, since it is larger than the sum of its proper divisors (62737660).

81336452 is a wasteful number, since it uses less digits than its factorization.

81336452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899 (or 897 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 81336452 is about 9018.6724078436. The cubic root of 81336452 is about 433.2731148405.

The spelling of 81336452 in words is "eighty-one million, three hundred thirty-six thousand, four hundred fifty-two".