772806666 has 8 divisors (see below), whose sum is σ = 1545613344. Its totient is φ = 257602220.

The previous prime is 772806653. The next prime is 772806667. The reversal of 772806666 is 666608277.

It is a happy number.

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

772806666 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (772806667) 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, 64400550 + ... + 64400561.

It is an arithmetic number, because the mean of its divisors is an integer number (193201668).

Almost surely, 2^772806666 is an apocalyptic number.

772806666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

772806666 is a wasteful number, since it uses less digits than its factorization.

772806666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128801116.

The product of its (nonzero) digits is 1016064, while the sum is 48.

The square root of 772806666 is about 27799.4004611610. The cubic root of 772806666 is about 917.6779287015.

The spelling of 772806666 in words is "seven hundred seventy-two million, eight hundred six thousand, six hundred sixty-six".