81677297 has 8 divisors (see below), whose sum is σ = 88768680. Its totient is φ = 74701440.

The previous prime is 81677287. The next prime is 81677303. The reversal of 81677297 is 79277618.

It can be written as a sum of positive squares in 4 ways, for example, as 118336 + 81558961 = 344^2 + 9031^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 81677297 - 2⁸ = 81677041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81677227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27404 + ... + 30237.

It is an arithmetic number, because the mean of its divisors is an integer number (11096085).

Almost surely, 2^81677297 is an apocalyptic number.

It is an amenable number.

81677297 is a deficient number, since it is larger than the sum of its proper divisors (7091383).

81677297 is a wasteful number, since it uses less digits than its factorization.

81677297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57763.

The product of its digits is 296352, while the sum is 47.

The square root of 81677297 is about 9037.5492806402. The cubic root of 81677297 is about 433.8774898959.

The spelling of 81677297 in words is "eighty-one million, six hundred seventy-seven thousand, two hundred ninety-seven".