81447676 has 12 divisors (see below), whose sum is σ = 145848472. Its totient is φ = 39776688.

The previous prime is 81447659. The next prime is 81447701. The reversal of 81447676 is 67674418.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236595 + ... + 236938.

Almost surely, 2^81447676 is an apocalyptic number.

81447676 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

81447676 is a deficient number, since it is larger than the sum of its proper divisors (64400796).

81447676 is a wasteful number, since it uses less digits than its factorization.

81447676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473580 (or 473578 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The square root of 81447676 is about 9024.8366190198. The cubic root of 81447676 is about 433.4705188266.

The spelling of 81447676 in words is "eighty-one million, four hundred forty-seven thousand, six hundred seventy-six".