81011784 has 32 divisors (see below), whose sum is σ = 231462720. Its totient is φ = 23146176.

The previous prime is 81011741. The next prime is 81011803. The reversal of 81011784 is 48711018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 240939 + ... + 241274.

It is an arithmetic number, because the mean of its divisors is an integer number (7233210).

Almost surely, 2^81011784 is an apocalyptic number.

81011784 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81011784 is an abundant number, since it is smaller than the sum of its proper divisors (150450936).

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

81011784 is a wasteful number, since it uses less digits than its factorization.

81011784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482229 (or 482225 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 30.

The square root of 81011784 is about 9000.6546428579. The cubic root of 81011784 is about 432.6958521352.

The spelling of 81011784 in words is "eighty-one million, eleven thousand, seven hundred eighty-four".