81450700 has 36 divisors (see below), whose sum is σ = 177679600. Its totient is φ = 32408640.

The previous prime is 81450697. The next prime is 81450709. The reversal of 81450700 is 705418.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (81450709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17854 + ... + 21946.

Almost surely, 2^81450700 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81450700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88839800).

81450700 is an abundant number, since it is smaller than the sum of its proper divisors (96228900).

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

81450700 is a wasteful number, since it uses less digits than its factorization.

81450700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4306 (or 4299 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 81450700 is about 9025.0041551237. The cubic root of 81450700 is about 433.4758834103.

The spelling of 81450700 in words is "eighty-one million, four hundred fifty thousand, seven hundred".