81487826 has 16 divisors (see below), whose sum is σ = 141984960. Its totient is φ = 34350480.

The previous prime is 81487811. The next prime is 81487831. The reversal of 81487826 is 62878418.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46856 + ... + 48563.

It is an arithmetic number, because the mean of its divisors is an integer number (8874060).

Almost surely, 2^81487826 is an apocalyptic number.

81487826 is a deficient number, since it is larger than the sum of its proper divisors (60497134).

81487826 is a wasteful number, since it uses less digits than its factorization.

81487826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95489.

The product of its digits is 172032, while the sum is 44.

The square root of 81487826 is about 9027.0607619535. The cubic root of 81487826 is about 433.5417342097.

The spelling of 81487826 in words is "eighty-one million, four hundred eighty-seven thousand, eight hundred twenty-six".