81733456 has 40 divisors (see below), whose sum is σ = 181488384. Its totient is φ = 34930560.

The previous prime is 81733451. The next prime is 81733471. The reversal of 81733456 is 65433718.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81733451) 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, 50841 + ... + 52423.

Almost surely, 2^81733456 is an apocalyptic number.

It is an amenable number.

81733456 is an abundant number, since it is smaller than the sum of its proper divisors (99754928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81733456 is a wasteful number, since it uses less digits than its factorization.

81733456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059 (or 2053 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The square root of 81733456 is about 9040.6557284303. The cubic root of 81733456 is about 433.9769077451.

Adding to 81733456 its product of digits (60480), we get a square (81793936 = 9044²).

The spelling of 81733456 in words is "eighty-one million, seven hundred thirty-three thousand, four hundred fifty-six".