81280396 has 12 divisors (see below), whose sum is σ = 142359448. Its totient is φ = 40606272.

The previous prime is 81280373. The next prime is 81280421. The reversal of 81280396 is 69308218.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2646 + ... + 13021.

Almost surely, 2^81280396 is an apocalyptic number.

It is an amenable number.

81280396 is a deficient number, since it is larger than the sum of its proper divisors (61079052).

81280396 is a wasteful number, since it uses less digits than its factorization.

81280396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16968 (or 16966 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 81280396 is about 9015.5640977146. The cubic root of 81280396 is about 433.1735566112.

The spelling of 81280396 in words is "eighty-one million, two hundred eighty thousand, three hundred ninety-six".