81353708 has 24 divisors (see below), whose sum is σ = 144012960. Its totient is φ = 40210560.

The previous prime is 81353707. The next prime is 81353719. The reversal of 81353708 is 80735318.

It is not an unprimeable number, because it can be changed into a prime (81353707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226433 + ... + 226791.

It is an arithmetic number, because the mean of its divisors is an integer number (6000540).

Almost surely, 2^81353708 is an apocalyptic number.

It is an amenable number.

81353708 is a deficient number, since it is larger than the sum of its proper divisors (62659252).

81353708 is a wasteful number, since it uses less digits than its factorization.

81353708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 81353708 is about 9019.6290389350. The cubic root of 81353708 is about 433.3037531419.

The spelling of 81353708 in words is "eighty-one million, three hundred fifty-three thousand, seven hundred eight".