77651428 has 6 divisors (see below), whose sum is σ = 135890006. Its totient is φ = 38825712.

The previous prime is 77651411. The next prime is 77651437. The reversal of 77651428 is 82415677.

It can be written as a sum of positive squares in only one way, i.e., 69856164 + 7795264 = 8358^2 + 2792^2 .

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 as a sum of consecutive naturals, namely, 9706425 + ... + 9706432.

Almost surely, 2^77651428 is an apocalyptic number.

It is an amenable number.

77651428 is a deficient number, since it is larger than the sum of its proper divisors (58238578).

77651428 is a wasteful number, since it uses less digits than its factorization.

77651428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19412861 (or 19412859 counting only the distinct ones).

The product of its digits is 94080, while the sum is 40.

The square root of 77651428 is about 8812.0047662266. The cubic root of 77651428 is about 426.6284522523.

The spelling of 77651428 in words is "seventy-seven million, six hundred fifty-one thousand, four hundred twenty-eight".