77427128 has 16 divisors (see below), whose sum is σ = 152817000. Its totient is φ = 36675936.

The previous prime is 77427127. The next prime is 77427167. The reversal of 77427128 is 82172477.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a junction number, because it is equal to n+sod(n) for n = 77427091 and 77427100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77427127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 254543 + ... + 254846.

Almost surely, 2^77427128 is an apocalyptic number.

It is an amenable number.

77427128 is a deficient number, since it is larger than the sum of its proper divisors (75389872).

77427128 is a wasteful number, since it uses less digits than its factorization.

77427128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509414 (or 509410 counting only the distinct ones).

The product of its digits is 43904, while the sum is 38.

The square root of 77427128 is about 8799.2686059695. The cubic root of 77427128 is about 426.2172769518.

The spelling of 77427128 in words is "seventy-seven million, four hundred twenty-seven thousand, one hundred twenty-eight".