77128633 has 4 divisors (see below), whose sum is σ = 77170468. Its totient is φ = 77086800.

The previous prime is 77128631. The next prime is 77128669. The reversal of 77128633 is 33682177.

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

It can be written as a sum of positive squares in 2 ways, for example, as 23736384 + 53392249 = 4872^2 + 7307^2 .

It is a cyclic number.

It is not a de Polignac number, because 77128633 - 2¹ = 77128631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77128592 and 77128601.

It is not an unprimeable number, because it can be changed into a prime (77128631) 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, 18018 + ... + 21883.

It is an arithmetic number, because the mean of its divisors is an integer number (19292617).

Almost surely, 2^77128633 is an apocalyptic number.

It is an amenable number.

77128633 is a deficient number, since it is larger than the sum of its proper divisors (41835).

77128633 is a wasteful number, since it uses less digits than its factorization.

77128633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41834.

The product of its digits is 42336, while the sum is 37.

The square root of 77128633 is about 8782.2908742537. The cubic root of 77128633 is about 425.6688577681.

The spelling of 77128633 in words is "seventy-seven million, one hundred twenty-eight thousand, six hundred thirty-three".