81463542 has 16 divisors (see below), whose sum is σ = 165689280. Its totient is φ = 26694152.

The previous prime is 81463537. The next prime is 81463561. The reversal of 81463542 is 24536418.

It is a congruent number.

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, 114708 + ... + 115415.

It is an arithmetic number, because the mean of its divisors is an integer number (10355580).

Almost surely, 2^81463542 is an apocalyptic number.

81463542 is an abundant number, since it is smaller than the sum of its proper divisors (84225738).

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

81463542 is a wasteful number, since it uses less digits than its factorization.

81463542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230187.

The product of its digits is 23040, while the sum is 33.

The square root of 81463542 is about 9025.7155948988. The cubic root of 81463542 is about 433.4986636719.

The spelling of 81463542 in words is "eighty-one million, four hundred sixty-three thousand, five hundred forty-two".