81634496 has 14 divisors (see below), whose sum is σ = 161993580. Its totient is φ = 40817216.

The previous prime is 81634471. The next prime is 81634499. The reversal of 81634496 is 69443618.

It is not an unprimeable number, because it can be changed into a prime (81634499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637706 + ... + 637833.

It is an arithmetic number, because the mean of its divisors is an integer number (11570970).

Almost surely, 2^81634496 is an apocalyptic number.

It is an amenable number.

81634496 is a deficient number, since it is larger than the sum of its proper divisors (80359084).

81634496 is a wasteful number, since it uses less digits than its factorization.

81634496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275551 (or 1275541 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The square root of 81634496 is about 9035.1810164490. The cubic root of 81634496 is about 433.8016890068.

The spelling of 81634496 in words is "eighty-one million, six hundred thirty-four thousand, four hundred ninety-six".