81100742 has 8 divisors (see below), whose sum is σ = 121753632. Its totient is φ = 40516200.

The previous prime is 81100729. The next prime is 81100787. The reversal of 81100742 is 24700118.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14009 + ... + 18932.

It is an arithmetic number, because the mean of its divisors is an integer number (15219204).

Almost surely, 2^81100742 is an apocalyptic number.

81100742 is a deficient number, since it is larger than the sum of its proper divisors (40652890).

81100742 is a wasteful number, since it uses less digits than its factorization.

81100742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34174.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 81100742 is about 9005.5950386413. The cubic root of 81100742 is about 432.8541734526.

The spelling of 81100742 in words is "eighty-one million, one hundred thousand, seven hundred forty-two".