81067742 has 16 divisors (see below), whose sum is σ = 142363872. Its totient is φ = 33895680.

The previous prime is 81067739. The next prime is 81067787. The reversal of 81067742 is 24776018.

It is a happy number.

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, 70043 + ... + 71190.

It is an arithmetic number, because the mean of its divisors is an integer number (8897742).

Almost surely, 2^81067742 is an apocalyptic number.

81067742 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81067742 is a deficient number, since it is larger than the sum of its proper divisors (61296130).

81067742 is a wasteful number, since it uses less digits than its factorization.

81067742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141283.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 81067742 is about 9003.7626579114. The cubic root of 81067742 is about 432.7954558411.

The spelling of 81067742 in words is "eighty-one million, sixty-seven thousand, seven hundred forty-two".