81677142 has 12 divisors (see below), whose sum is σ = 176967180. Its totient is φ = 27225708.

The previous prime is 81677131. The next prime is 81677147. The reversal of 81677142 is 24177618.

It is a junction number, because it is equal to n+sod(n) for n = 81677097 and 81677106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81677147) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2268792 + ... + 2268827.

It is an arithmetic number, because the mean of its divisors is an integer number (14747265).

Almost surely, 2^81677142 is an apocalyptic number.

81677142 is an abundant number, since it is smaller than the sum of its proper divisors (95290038).

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

81677142 is a wasteful number, since it uses less digits than its factorization.

81677142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537627 (or 4537624 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 81677142 is about 9037.5407053025. The cubic root of 81677142 is about 433.8772154375.

The spelling of 81677142 in words is "eighty-one million, six hundred seventy-seven thousand, one hundred forty-two".