81455288 has 16 divisors (see below), whose sum is σ = 154242360. Its totient is φ = 40324000.

The previous prime is 81455281. The next prime is 81455293. The reversal of 81455288 is 88255418.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81455281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49598 + ... + 51213.

Almost surely, 2^81455288 is an apocalyptic number.

It is an amenable number.

81455288 is a deficient number, since it is larger than the sum of its proper divisors (72787072).

81455288 is a wasteful number, since it uses less digits than its factorization.

81455288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100918 (or 100914 counting only the distinct ones).

The product of its digits is 102400, while the sum is 41.

The square root of 81455288 is about 9025.2583342528. The cubic root of 81455288 is about 433.4840222805.

The spelling of 81455288 in words is "eighty-one million, four hundred fifty-five thousand, two hundred eighty-eight".