77109826428 has 72 divisors (see below), whose sum is σ = 203634456480. Its totient is φ = 24571209600.

The previous prime is 77109826421. The next prime is 77109826501. The reversal of 77109826428 is 82462890177.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77109826421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 260200 + ... + 471087.

It is an arithmetic number, because the mean of its divisors is an integer number (2828256340).

Almost surely, 2^77109826428 is an apocalyptic number.

It is an amenable number.

77109826428 is an abundant number, since it is smaller than the sum of its proper divisors (126524630052).

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

77109826428 is a wasteful number, since it uses less digits than its factorization.

77109826428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731427 (or 731422 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 54.

The spelling of 77109826428 in words is "seventy-seven billion, one hundred nine million, eight hundred twenty-six thousand, four hundred twenty-eight".