81453384 has 32 divisors (see below), whose sum is σ = 226260000. Its totient is φ = 27151056.

The previous prime is 81453371. The next prime is 81453389. The reversal of 81453384 is 48335418.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81453389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188334 + ... + 188765.

It is an arithmetic number, because the mean of its divisors is an integer number (7070625).

Almost surely, 2^81453384 is an apocalyptic number.

It is an amenable number.

81453384 is an abundant number, since it is smaller than the sum of its proper divisors (144806616).

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

81453384 is a wasteful number, since it uses less digits than its factorization.

81453384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377114 (or 377104 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 81453384 is about 9025.1528518912. The cubic root of 81453384 is about 433.4806447220.

The spelling of 81453384 in words is "eighty-one million, four hundred fifty-three thousand, three hundred eighty-four".