776428849 has 16 divisors (see below), whose sum is σ = 924416640. Its totient is φ = 638259840.

The previous prime is 776428847. The next prime is 776428859. The reversal of 776428849 is 948824677.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 776428849 - 2¹ = 776428847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 776428849.

It is not an unprimeable number, because it can be changed into a prime (776428843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5994 + ... + 39859.

It is an arithmetic number, because the mean of its divisors is an integer number (57776040).

Almost surely, 2^776428849 is an apocalyptic number.

It is an amenable number.

776428849 is a deficient number, since it is larger than the sum of its proper divisors (147987791).

776428849 is a wasteful number, since it uses less digits than its factorization.

776428849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45960.

The product of its digits is 5419008, while the sum is 55.

The square root of 776428849 is about 27864.4728821487. The cubic root of 776428849 is about 919.1094284426.

The spelling of 776428849 in words is "seven hundred seventy-six million, four hundred twenty-eight thousand, eight hundred forty-nine".