777406668 has 24 divisors (see below), whose sum is σ = 1920652272. Its totient is φ = 243892224.

The previous prime is 777406661. The next prime is 777406687. The reversal of 777406668 is 866604777.

It is a super-2 number, since 2×777406668² = 1208722254901724448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 777406668.

It is not an unprimeable number, because it can be changed into a prime (777406661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1905205 + ... + 1905612.

It is an arithmetic number, because the mean of its divisors is an integer number (80027178).

Almost surely, 2^777406668 is an apocalyptic number.

It is an amenable number.

777406668 is an abundant number, since it is smaller than the sum of its proper divisors (1143245604).

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

777406668 is a wasteful number, since it uses less digits than its factorization.

777406668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810841 (or 3810839 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 51.

The square root of 777406668 is about 27882.0133419378. The cubic root of 777406668 is about 919.4951026094.

The spelling of 777406668 in words is "seven hundred seventy-seven million, four hundred six thousand, six hundred sixty-eight".