77728027 has 4 divisors (see below), whose sum is σ = 83707120. Its totient is φ = 71748936.

The previous prime is 77728019. The next prime is 77728073. The reversal of 77728027 is 72082777.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77728027 - 2³ = 77728019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77728127) 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, 2989527 + ... + 2989552.

It is an arithmetic number, because the mean of its divisors is an integer number (20926780).

Almost surely, 2^77728027 is an apocalyptic number.

77728027 is a deficient number, since it is larger than the sum of its proper divisors (5979093).

77728027 is a wasteful number, since it uses less digits than its factorization.

77728027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5979092.

The product of its (nonzero) digits is 76832, while the sum is 40.

The square root of 77728027 is about 8816.3499817101. The cubic root of 77728027 is about 426.7686882363.

The spelling of 77728027 in words is "seventy-seven million, seven hundred twenty-eight thousand, twenty-seven".