77851028 has 12 divisors (see below), whose sum is σ = 136354932. Its totient is φ = 38892480.

The previous prime is 77851019. The next prime is 77851043. The reversal of 77851028 is 82015877.

It can be written as a sum of positive squares in 2 ways, for example, as 56580484 + 21270544 = 7522^2 + 4612^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77850982 and 77851000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513 + ... + 12728.

It is an arithmetic number, because the mean of its divisors is an integer number (11362911).

Almost surely, 2^77851028 is an apocalyptic number.

It is an amenable number.

77851028 is a deficient number, since it is larger than the sum of its proper divisors (58503904).

77851028 is a wasteful number, since it uses less digits than its factorization.

77851028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16522 (or 16520 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 77851028 is about 8823.3229568003. The cubic root of 77851028 is about 426.9936834859.

The spelling of 77851028 in words is "seventy-seven million, eight hundred fifty-one thousand, twenty-eight".