81501828 has 12 divisors (see below), whose sum is σ = 190170960. Its totient is φ = 27167272.

The previous prime is 81501779. The next prime is 81501881. The reversal of 81501828 is 82810518.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395898 + ... + 3395921.

It is an arithmetic number, because the mean of its divisors is an integer number (15847580).

Almost surely, 2^81501828 is an apocalyptic number.

It is an amenable number.

81501828 is an abundant number, since it is smaller than the sum of its proper divisors (108669132).

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

81501828 is a wasteful number, since it uses less digits than its factorization.

81501828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6791826 (or 6791824 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 81501828 is about 9027.8362856224. The cubic root of 81501828 is about 433.5665645188.

The spelling of 81501828 in words is "eighty-one million, five hundred one thousand, eight hundred twenty-eight".