81464410 has 8 divisors (see below), whose sum is σ = 146635956. Its totient is φ = 32585760.

The previous prime is 81464407. The next prime is 81464443. The reversal of 81464410 is 1446418.

It can be written as a sum of positive squares in 2 ways, for example, as 78481881 + 2982529 = 8859^2 + 1727^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4073211 + ... + 4073230.

Almost surely, 2^81464410 is an apocalyptic number.

81464410 is a deficient number, since it is larger than the sum of its proper divisors (65171546).

81464410 is a wasteful number, since it uses less digits than its factorization.

81464410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8146448.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 81464410 is about 9025.7636796007. The cubic root of 81464410 is about 433.5002033198.

The spelling of 81464410 in words is "eighty-one million, four hundred sixty-four thousand, four hundred ten".