81407468 has 18 divisors (see below), whose sum is σ = 146034588. Its totient is φ = 39707680.

The previous prime is 81407449. The next prime is 81407477. The reversal of 81407468 is 86470418.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 671 + ... + 12777.

Almost surely, 2^81407468 is an apocalyptic number.

It is an amenable number.

81407468 is a deficient number, since it is larger than the sum of its proper divisors (64627120).

81407468 is a wasteful number, since it uses less digits than its factorization.

81407468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12193 (or 12150 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 81407468 is about 9022.6087136703. The cubic root of 81407468 is about 433.3991771085.

The spelling of 81407468 in words is "eighty-one million, four hundred seven thousand, four hundred sixty-eight".