81741120 has 56 divisors (see below), whose sum is σ = 259531104. Its totient is φ = 21797376.

The previous prime is 81741113. The next prime is 81741133. The reversal of 81741120 is 2114718.

It is a super-2 number, since 2×81741120² = 13363221397708800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 41614 + ... + 43533.

It is an arithmetic number, because the mean of its divisors is an integer number (4634484).

Almost surely, 2^81741120 is an apocalyptic number.

81741120 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81741120 is an abundant number, since it is smaller than the sum of its proper divisors (177789984).

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

81741120 is a wasteful number, since it uses less digits than its factorization.

81741120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85167 (or 85157 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 81741120 is about 9041.0795815544. The cubic root of 81741120 is about 433.9904717340.

Adding to 81741120 its reverse (2114718), we get a palindrome (83855838).

The spelling of 81741120 in words is "eighty-one million, seven hundred forty-one thousand, one hundred twenty".