81350784 has 64 divisors (see below), whose sum is σ = 240108000. Its totient is φ = 27115776.

The previous prime is 81350783. The next prime is 81350807. The reversal of 81350784 is 48705318.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (81350783) 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, 8314 + ... + 15225.

Almost surely, 2^81350784 is an apocalyptic number.

It is an amenable number.

81350784 is an abundant number, since it is smaller than the sum of its proper divisors (158757216).

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

81350784 is a wasteful number, since it uses less digits than its factorization.

81350784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23562 (or 23544 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 81350784 is about 9019.4669465551. The cubic root of 81350784 is about 433.2985618385.

The spelling of 81350784 in words is "eighty-one million, three hundred fifty thousand, seven hundred eighty-four".