81464042 has 8 divisors (see below), whose sum is σ = 133304832. Its totient is φ = 37029100.

The previous prime is 81464041. The next prime is 81464069. The reversal of 81464042 is 24046418.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81463996 and 81464014.

It is not an unprimeable number, because it can be changed into a prime (81464041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1851434 + ... + 1851477.

It is an arithmetic number, because the mean of its divisors is an integer number (16663104).

Almost surely, 2^81464042 is an apocalyptic number.

81464042 is a deficient number, since it is larger than the sum of its proper divisors (51840790).

81464042 is a wasteful number, since it uses less digits than its factorization.

81464042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3702924.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 81464042 is about 9025.7432934911. The cubic root of 81464042 is about 433.4995505672.

The spelling of 81464042 in words is "eighty-one million, four hundred sixty-four thousand, forty-two".