76905405 has 12 divisors (see below), whose sum is σ = 133302780. Its totient is φ = 41016192.

The previous prime is 76905401. The next prime is 76905431. The reversal of 76905405 is 50450967.

It can be written as a sum of positive squares in 2 ways, for example, as 16112196 + 60793209 = 4014^2 + 7797^2 .

It is not a de Polignac number, because 76905405 - 2² = 76905401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76905405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76905401) 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 11 ways as a sum of consecutive naturals, for example, 854460 + ... + 854549.

It is an arithmetic number, because the mean of its divisors is an integer number (11108565).

Almost surely, 2^76905405 is an apocalyptic number.

It is an amenable number.

76905405 is a deficient number, since it is larger than the sum of its proper divisors (56397375).

76905405 is a wasteful number, since it uses less digits than its factorization.

76905405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709020 (or 1709017 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 76905405 is about 8769.5726805814. The cubic root of 76905405 is about 425.2577997609.

The spelling of 76905405 in words is "seventy-six million, nine hundred five thousand, four hundred five".