81162942 has 32 divisors (see below), whose sum is σ = 186354432. Its totient is φ = 23084544.

The previous prime is 81162931. The next prime is 81162959. The reversal of 81162942 is 24926118.

It is a super-4 number, since 4×81162942⁴ (a number of 33 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5278 + ... + 13790.

It is an arithmetic number, because the mean of its divisors is an integer number (5823576).

Almost surely, 2^81162942 is an apocalyptic number.

81162942 is an abundant number, since it is smaller than the sum of its proper divisors (105191490).

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

81162942 is a wasteful number, since it uses less digits than its factorization.

81162942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8752.

The product of its digits is 6912, while the sum is 33.

The square root of 81162942 is about 9009.0477854211. The cubic root of 81162942 is about 432.9648039634.

The spelling of 81162942 in words is "eighty-one million, one hundred sixty-two thousand, nine hundred forty-two".