81677379 has 8 divisors (see below), whose sum is σ = 124460800. Its totient is φ = 46672776.

The previous prime is 81677377. The next prime is 81677411. The reversal of 81677379 is 97377618.

It is a happy number.

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

It is not a de Polignac number, because 81677379 - 2¹ = 81677377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81677377) by changing a digit.

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, 1944679 + ... + 1944720.

It is an arithmetic number, because the mean of its divisors is an integer number (15557600).

Almost surely, 2^81677379 is an apocalyptic number.

81677379 is a deficient number, since it is larger than the sum of its proper divisors (42783421).

81677379 is a wasteful number, since it uses less digits than its factorization.

81677379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3889409.

The product of its digits is 444528, while the sum is 48.

The square root of 81677379 is about 9037.5538172671. The cubic root of 81677379 is about 433.8776350931.

The spelling of 81677379 in words is "eighty-one million, six hundred seventy-seven thousand, three hundred seventy-nine".