766670405 has 8 divisors (see below), whose sum is σ = 923823384. Its totient is φ = 610790400.

The previous prime is 766670353. The next prime is 766670417. The reversal of 766670405 is 504076667.

It can be written as a sum of positive squares in 4 ways, for example, as 93683041 + 672987364 = 9679^2 + 25942^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 766670405 - 2¹⁰ = 766669381 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316916 + ... + 319325.

It is an arithmetic number, because the mean of its divisors is an integer number (115477923).

Almost surely, 2^766670405 is an apocalyptic number.

It is an amenable number.

766670405 is a deficient number, since it is larger than the sum of its proper divisors (157152979).

766670405 is a wasteful number, since it uses less digits than its factorization.

766670405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636487.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 766670405 is about 27688.8137160117. The cubic root of 766670405 is about 915.2426143551.

The spelling of 766670405 in words is "seven hundred sixty-six million, six hundred seventy thousand, four hundred five".