83780357 has 4 divisors (see below), whose sum is σ = 84205836. Its totient is φ = 83354880.

The previous prime is 83780353. The next prime is 83780377. The reversal of 83780357 is 75308738.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 78393316 + 5387041 = 8854^2 + 2321^2 .

It is a cyclic number.

It is not a de Polignac number, because 83780357 - 2² = 83780353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83780353) 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, 212444 + ... + 212837.

It is an arithmetic number, because the mean of its divisors is an integer number (21051459).

Almost surely, 2^83780357 is an apocalyptic number.

It is an amenable number.

83780357 is a deficient number, since it is larger than the sum of its proper divisors (425479).

83780357 is a wasteful number, since it uses less digits than its factorization.

83780357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425478.

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

The square root of 83780357 is about 9153.1610386795. The cubic root of 83780357 is about 437.5698622584.

The spelling of 83780357 in words is "eighty-three million, seven hundred eighty thousand, three hundred fifty-seven".