83784560 has 20 divisors (see below), whose sum is σ = 194799288. Its totient is φ = 33513792.

The previous prime is 83784529. The next prime is 83784563. The reversal of 83784560 is 6548738.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83784563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 523574 + ... + 523733.

Almost surely, 2^83784560 is an apocalyptic number.

83784560 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83784560 is an abundant number, since it is smaller than the sum of its proper divisors (111014728).

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

83784560 is a wasteful number, since it uses less digits than its factorization.

83784560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1047320 (or 1047314 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 83784560 is about 9153.3906286141. The cubic root of 83784560 is about 437.5771793092.

The spelling of 83784560 in words is "eighty-three million, seven hundred eighty-four thousand, five hundred sixty".