81404610 has 32 divisors (see below), whose sum is σ = 223281792. Its totient is φ = 18606720.

The previous prime is 81404593. The next prime is 81404621. The reversal of 81404610 is 1640418.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193611 + ... + 194030.

It is an arithmetic number, because the mean of its divisors is an integer number (6977556).

Almost surely, 2^81404610 is an apocalyptic number.

81404610 is an abundant number, since it is smaller than the sum of its proper divisors (141877182).

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

81404610 is a wasteful number, since it uses less digits than its factorization.

81404610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387658.

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 81404610 is about 9022.4503323654. The cubic root of 81404610 is about 433.3941052177.

The spelling of 81404610 in words is "eighty-one million, four hundred four thousand, six hundred ten".