81353800 has 48 divisors (see below), whose sum is σ = 206348400. Its totient is φ = 29582400.

The previous prime is 81353791. The next prime is 81353819. The reversal of 81353800 is 835318.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16290 + ... + 20689.

It is an arithmetic number, because the mean of its divisors is an integer number (4298925).

Almost surely, 2^81353800 is an apocalyptic number.

It is an amenable number.

81353800 is an abundant number, since it is smaller than the sum of its proper divisors (124994600).

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

81353800 is a wasteful number, since it uses less digits than its factorization.

81353800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37006 (or 36997 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 81353800 is about 9019.6341389216. The cubic root of 81353800 is about 433.3039164778.

It can be divided in two parts, 8135 and 3800, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 81353800 in words is "eighty-one million, three hundred fifty-three thousand, eight hundred".