83780573 has 8 divisors (see below), whose sum is σ = 89495928. Its totient is φ = 78152704.

The previous prime is 83780563. The next prime is 83780581. The reversal of 83780573 is 37508738.

It can be written as a sum of positive squares in 4 ways, for example, as 9872164 + 73908409 = 3142^2 + 8597^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83780573 - 2⁸ = 83780317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83780573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83780563) 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, 19886 + ... + 23727.

It is an arithmetic number, because the mean of its divisors is an integer number (11186991).

Almost surely, 2^83780573 is an apocalyptic number.

It is an amenable number.

83780573 is a deficient number, since it is larger than the sum of its proper divisors (5715355).

83780573 is a wasteful number, since it uses less digits than its factorization.

83780573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43743.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 83780573 is about 9153.1728378743. The cubic root of 83780573 is about 437.5702383012.

The spelling of 83780573 in words is "eighty-three million, seven hundred eighty thousand, five hundred seventy-three".