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81144042 = 2371932001
BaseRepresentation
bin1001101011000…
…10100011101010
312122200112200220
410311202203222
5131233102132
612015110510
72003466360
oct465424352
9178615626
1081144042
11418927a1
1223212436
1313a71035
14aac3630
1571cca2c
hex4d628ea

81144042 has 16 divisors (see below), whose sum is σ = 185472192. Its totient is φ = 23184000.

The previous prime is 81144031. The next prime is 81144061. The reversal of 81144042 is 24044118.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 965959 + ... + 966042.

It is an arithmetic number, because the mean of its divisors is an integer number (11592012).

Almost surely, 281144042 is an apocalyptic number.

81144042 is an abundant number, since it is smaller than the sum of its proper divisors (104328150).

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

81144042 is a wasteful number, since it uses less digits than its factorization.

81144042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932013.

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 81144042 is about 9007.9987788631. The cubic root of 81144042 is about 432.9311939198.

It can be divided in two parts, 8114404 and 2, that added together give a triangular number (8114406 = T4028).

The spelling of 81144042 in words is "eighty-one million, one hundred forty-four thousand, forty-two".

Divisors: 1 2 3 6 7 14 21 42 1932001 3864002 5796003 11592006 13524007 27048014 40572021 81144042