77545428 has 12 divisors (see below), whose sum is σ = 180939360. Its totient is φ = 25848472.

The previous prime is 77545421. The next prime is 77545453. The reversal of 77545428 is 82454577.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 77545428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77545421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3231048 + ... + 3231071.

It is an arithmetic number, because the mean of its divisors is an integer number (15078280).

Almost surely, 2^77545428 is an apocalyptic number.

It is an amenable number.

77545428 is an abundant number, since it is smaller than the sum of its proper divisors (103393932).

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

77545428 is a wasteful number, since it uses less digits than its factorization.

77545428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6462126 (or 6462124 counting only the distinct ones).

The product of its digits is 313600, while the sum is 42.

The square root of 77545428 is about 8805.9881898626. The cubic root of 77545428 is about 426.4342372836.

The spelling of 77545428 in words is "seventy-seven million, five hundred forty-five thousand, four hundred twenty-eight".