81674456 has 8 divisors (see below), whose sum is σ = 153139620. Its totient is φ = 40837224.

The previous prime is 81674423. The next prime is 81674459. The reversal of 81674456 is 65447618.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81674459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5104646 + ... + 5104661.

Almost surely, 2^81674456 is an apocalyptic number.

It is an amenable number.

81674456 is a deficient number, since it is larger than the sum of its proper divisors (71465164).

81674456 is a wasteful number, since it uses less digits than its factorization.

81674456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10209313 (or 10209309 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 81674456 is about 9037.3921017072. The cubic root of 81674456 is about 433.8724592844.

The spelling of 81674456 in words is "eighty-one million, six hundred seventy-four thousand, four hundred fifty-six".