83780557 has 8 divisors (see below), whose sum is σ = 100788800. Its totient is φ = 68032224.

The previous prime is 83780551. The next prime is 83780563. The reversal of 83780557 is 75508738.

It is an interprime number because it is at equal distance from previous prime (83780551) and next prime (83780563).

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 83780557 - 2⁷ = 83780429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83780551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 314832 + ... + 315097.

It is an arithmetic number, because the mean of its divisors is an integer number (12598600).

Almost surely, 2^83780557 is an apocalyptic number.

It is an amenable number.

83780557 is a deficient number, since it is larger than the sum of its proper divisors (17008243).

83780557 is a wasteful number, since it uses less digits than its factorization.

83780557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629955.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 83780557 is about 9153.1719638604. The cubic root of 83780557 is about 437.5702104462.

The spelling of 83780557 in words is "eighty-three million, seven hundred eighty thousand, five hundred fifty-seven".