81455410 has 8 divisors (see below), whose sum is σ = 146619756. Its totient is φ = 32582160.

The previous prime is 81455401. The next prime is 81455417. The reversal of 81455410 is 1455418.

It can be written as a sum of positive squares in 2 ways, for example, as 73564929 + 7890481 = 8577^2 + 2809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81455417) 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, 4072761 + ... + 4072780.

Almost surely, 2^81455410 is an apocalyptic number.

81455410 is a deficient number, since it is larger than the sum of its proper divisors (65164346).

81455410 is a wasteful number, since it uses less digits than its factorization.

81455410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8145548.

The product of its (nonzero) digits is 3200, while the sum is 28.

The square root of 81455410 is about 9025.2650930596. The cubic root of 81455410 is about 433.4842386979.

The spelling of 81455410 in words is "eighty-one million, four hundred fifty-five thousand, four hundred ten".