81476747 has 8 divisors (see below), whose sum is σ = 91949040. Its totient is φ = 71515360.

The previous prime is 81476743. The next prime is 81476749. The reversal of 81476747 is 74767418.

It is a happy number.

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 81476747 - 2² = 81476743 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81476698 and 81476707.

It is not an unprimeable number, because it can be changed into a prime (81476743) 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, 127388 + ... + 128025.

It is an arithmetic number, because the mean of its divisors is an integer number (11493630).

Almost surely, 2^81476747 is an apocalyptic number.

81476747 is a deficient number, since it is larger than the sum of its proper divisors (10472293).

81476747 is a wasteful number, since it uses less digits than its factorization.

81476747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255453.

The product of its digits is 263424, while the sum is 44.

The square root of 81476747 is about 9026.4470862017. The cubic root of 81476747 is about 433.5220853583.

The spelling of 81476747 in words is "eighty-one million, four hundred seventy-six thousand, seven hundred forty-seven".