83780405 has 8 divisors (see below), whose sum is σ = 105828000. Its totient is φ = 63496656.

The previous prime is 83780401. The next prime is 83780407. The reversal of 83780405 is 50408738.

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 83780405 - 2² = 83780401 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83780401) 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, 440855 + ... + 441044.

It is an arithmetic number, because the mean of its divisors is an integer number (13228500).

Almost surely, 2^83780405 is an apocalyptic number.

It is an amenable number.

83780405 is a deficient number, since it is larger than the sum of its proper divisors (22047595).

83780405 is a wasteful number, since it uses less digits than its factorization.

83780405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881923.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 83780405 is about 9153.1636607241. The cubic root of 83780405 is about 437.5699458235.

The spelling of 83780405 in words is "eighty-three million, seven hundred eighty thousand, four hundred five".