81279902 has 16 divisors (see below), whose sum is σ = 133805952. Its totient is φ = 36722520.

The previous prime is 81279881. The next prime is 81279937. The reversal of 81279902 is 20997218.

It is a congruent 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, 7388 + ... + 14735.

It is an arithmetic number, because the mean of its divisors is an integer number (8362872).

Almost surely, 2^81279902 is an apocalyptic number.

81279902 is a deficient number, since it is larger than the sum of its proper divisors (52526050).

81279902 is a wasteful number, since it uses less digits than its factorization.

81279902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22303.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 81279902 is about 9015.5367006075. The cubic root of 81279902 is about 433.1726790393.

The spelling of 81279902 in words is "eighty-one million, two hundred seventy-nine thousand, nine hundred two".