77748428 has 6 divisors (see below), whose sum is σ = 136059756. Its totient is φ = 38874212.

The previous prime is 77748427. The next prime is 77748457. The reversal of 77748428 is 82484777.

It is not an unprimeable number, because it can be changed into a prime (77748421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9718550 + ... + 9718557.

It is an arithmetic number, because the mean of its divisors is an integer number (22676626).

Almost surely, 2^77748428 is an apocalyptic number.

It is an amenable number.

77748428 is a deficient number, since it is larger than the sum of its proper divisors (58311328).

77748428 is a wasteful number, since it uses less digits than its factorization.

77748428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19437111 (or 19437109 counting only the distinct ones).

The product of its digits is 702464, while the sum is 47.

The square root of 77748428 is about 8817.5069038816. The cubic root of 77748428 is about 426.8060224589.

The spelling of 77748428 in words is "seventy-seven million, seven hundred forty-eight thousand, four hundred twenty-eight".