81238496 has 12 divisors (see below), whose sum is σ = 159938352. Its totient is φ = 40619232.

The previous prime is 81238489. The next prime is 81238499. The reversal of 81238496 is 69483218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81238499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269320 + ... + 1269383.

It is an arithmetic number, because the mean of its divisors is an integer number (13328196).

Almost surely, 2^81238496 is an apocalyptic number.

It is an amenable number.

81238496 is a deficient number, since it is larger than the sum of its proper divisors (78699856).

81238496 is a wasteful number, since it uses less digits than its factorization.

81238496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538713 (or 2538705 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 81238496 is about 9013.2400389649. The cubic root of 81238496 is about 433.0991102396.

The spelling of 81238496 in words is "eighty-one million, two hundred thirty-eight thousand, four hundred ninety-six".