81928902 has 16 divisors (see below), whose sum is σ = 178754112. Its totient is φ = 24826920.

The previous prime is 81928901. The next prime is 81928919. The reversal of 81928902 is 20982918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81928901) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 620608 + ... + 620739.

It is an arithmetic number, because the mean of its divisors is an integer number (11172132).

Almost surely, 2^81928902 is an apocalyptic number.

81928902 is an abundant number, since it is smaller than the sum of its proper divisors (96825210).

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

81928902 is a wasteful number, since it uses less digits than its factorization.

81928902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241363.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 81928902 is about 9051.4585564980. The cubic root of 81928902 is about 434.3225496906.

The spelling of 81928902 in words is "eighty-one million, nine hundred twenty-eight thousand, nine hundred two".