81142048 has 24 divisors (see below), whose sum is σ = 172037628. Its totient is φ = 37449984.

The previous prime is 81142031. The next prime is 81142067. The reversal of 81142048 is 84024118.

It can be written as a sum of positive squares in 2 ways, for example, as 68095504 + 13046544 = 8252^2 + 3612^2 .

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, 97111 + ... + 97942.

Almost surely, 2^81142048 is an apocalyptic number.

It is an amenable number.

81142048 is an abundant number, since it is smaller than the sum of its proper divisors (90895580).

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

81142048 is a wasteful number, since it uses less digits than its factorization.

81142048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195076 (or 195068 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 28.

The square root of 81142048 is about 9007.8880987721. Note that the first 3 decimals coincide. The cubic root of 81142048 is about 432.9276476670.

It can be divided in two parts, 81 and 142048, that added together give a square (142129 = 377²).

The spelling of 81142048 in words is "eighty-one million, one hundred forty-two thousand, forty-eight".