81413044 has 24 divisors (see below), whose sum is σ = 146397888. Its totient is φ = 39591360.

The previous prime is 81413041. The next prime is 81413047. The reversal of 81413044 is 44031418.

It is an interprime number because it is at equal distance from previous prime (81413041) and next prime (81413047).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81413041) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 76057 + ... + 77119.

It is an arithmetic number, because the mean of its divisors is an integer number (6099912).

Almost surely, 2^81413044 is an apocalyptic number.

It is an amenable number.

81413044 is a deficient number, since it is larger than the sum of its proper divisors (64984844).

81413044 is a wasteful number, since it uses less digits than its factorization.

81413044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1573 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 81413044 is about 9022.9177099207. The cubic root of 81413044 is about 433.4090721001.

The spelling of 81413044 in words is "eighty-one million, four hundred thirteen thousand, forty-four".