83770405 has 8 divisors (see below), whose sum is σ = 103241592. Its totient is φ = 65204928.

The previous prime is 83770399. The next prime is 83770409. The reversal of 83770405 is 50407738.

It can be written as a sum of positive squares in 4 ways, for example, as 3094081 + 80676324 = 1759^2 + 8982^2 .

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 83770405 - 2¹⁹ = 83246117 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 (83770409) 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, 226222 + ... + 226591.

It is an arithmetic number, because the mean of its divisors is an integer number (12905199).

Almost surely, 2^83770405 is an apocalyptic number.

It is an amenable number.

83770405 is a deficient number, since it is larger than the sum of its proper divisors (19471187).

83770405 is a wasteful number, since it uses less digits than its factorization.

83770405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452855.

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 83770405 is about 9152.6173852074. The cubic root of 83770405 is about 437.5525357320.

The spelling of 83770405 in words is "eighty-three million, seven hundred seventy thousand, four hundred five".