81784016 has 20 divisors (see below), whose sum is σ = 159510624. Its totient is φ = 40620000.

The previous prime is 81784007. The next prime is 81784033. The reversal of 81784016 is 61048718.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14510 + ... + 19341.

Almost surely, 2^81784016 is an apocalyptic number.

It is an amenable number.

81784016 is a deficient number, since it is larger than the sum of its proper divisors (77726608).

81784016 is a wasteful number, since it uses less digits than its factorization.

81784016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34010 (or 34004 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 35.

The square root of 81784016 is about 9043.4515534723. The cubic root of 81784016 is about 434.0663747790.

The spelling of 81784016 in words is "eighty-one million, seven hundred eighty-four thousand, sixteen".