776421668 has 18 divisors (see below), whose sum is σ = 1493489718. Its totient is φ = 352918720.

The previous prime is 776421593. The next prime is 776421689. The reversal of 776421668 is 866124677.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 484968484 + 291453184 = 22022^2 + 17072^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 801605 + ... + 802572.

It is an arithmetic number, because the mean of its divisors is an integer number (82971651).

Almost surely, 2^776421668 is an apocalyptic number.

It is an amenable number.

776421668 is a deficient number, since it is larger than the sum of its proper divisors (717068050).

776421668 is a wasteful number, since it uses less digits than its factorization.

776421668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604203 (or 1604190 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 776421668 is about 27864.3440260129. The cubic root of 776421668 is about 919.1065948946.

The spelling of 776421668 in words is "seven hundred seventy-six million, four hundred twenty-one thousand, six hundred sixty-eight".