77728533 has 8 divisors (see below), whose sum is σ = 103678848. Its totient is φ = 51798624.

The previous prime is 77728531. The next prime is 77728537. The reversal of 77728533 is 33582777.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77728533 - 2¹ = 77728531 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77728531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11641 + ... + 17057.

It is an arithmetic number, because the mean of its divisors is an integer number (12959856).

Almost surely, 2^77728533 is an apocalyptic number.

It is an amenable number.

77728533 is a deficient number, since it is larger than the sum of its proper divisors (25950315).

77728533 is a wasteful number, since it uses less digits than its factorization.

77728533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10203.

The product of its digits is 246960, while the sum is 42.

The square root of 77728533 is about 8816.3786783463. The cubic root of 77728533 is about 426.7696143050.

The spelling of 77728533 in words is "seventy-seven million, seven hundred twenty-eight thousand, five hundred thirty-three".