83505780 has 36 divisors (see below), whose sum is σ = 253301412. Its totient is φ = 22268160.

The previous prime is 83505769. The next prime is 83505797. The reversal of 83505780 is 8750538.

It is a happy number.

83505780 is a `hidden beast` number, since 83 + 5 + 0 + 578 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 62821476 + 20684304 = 7926^2 + 4548^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 231781 + ... + 232140.

Almost surely, 2^83505780 is an apocalyptic number.

It is an amenable number.

83505780 is an abundant number, since it is smaller than the sum of its proper divisors (169795632).

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

83505780 is a wasteful number, since it uses less digits than its factorization.

83505780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463936 (or 463931 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 83505780 is about 9138.1497033043. The cubic root of 83505780 is about 437.0913168579.

The spelling of 83505780 in words is "eighty-three million, five hundred five thousand, seven hundred eighty".