766665420 has 48 divisors (see below), whose sum is σ = 2148851040. Its totient is φ = 204235776.

The previous prime is 766665407. The next prime is 766665461. The reversal of 766665420 is 24566667.

766665420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58164 + ... + 70116.

It is an arithmetic number, because the mean of its divisors is an integer number (44767730).

Almost surely, 2^766665420 is an apocalyptic number.

It is an amenable number.

766665420 is an abundant number, since it is smaller than the sum of its proper divisors (1382185620).

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

766665420 is a wasteful number, since it uses less digits than its factorization.

766665420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13034 (or 13032 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The square root of 766665420 is about 27688.7236975632. The cubic root of 766665420 is about 915.2406306716.

The spelling of 766665420 in words is "seven hundred sixty-six million, six hundred sixty-five thousand, four hundred twenty".