776721 has 8 divisors (see below), whose sum is σ = 1129824. Its totient is φ = 470720.

The previous prime is 776719. The next prime is 776729. The reversal of 776721 is 127677.

It is a happy number.

776721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 776721 - 2¹ = 776719 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 776721.

It is not an unprimeable number, because it can be changed into a prime (776729) 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, 11736 + ... + 11801.

It is an arithmetic number, because the mean of its divisors is an integer number (141228).

2⁷⁷⁶⁷²¹ is an apocalyptic number.

It is an amenable number.

776721 is a deficient number, since it is larger than the sum of its proper divisors (353103).

776721 is a wasteful number, since it uses less digits than its factorization.

776721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23551.

The product of its digits is 4116, while the sum is 30.

The square root of 776721 is about 881.3177633521. The cubic root of 776721 is about 91.9224693379.

The spelling of 776721 in words is "seven hundred seventy-six thousand, seven hundred twenty-one".