77284133 has 4 divisors (see below), whose sum is σ = 78551148. Its totient is φ = 76017120.

The previous prime is 77284111. The next prime is 77284169. The reversal of 77284133 is 33148277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33148277 = 421 ⋅78737.

It can be written as a sum of positive squares in 2 ways, for example, as 5678689 + 71605444 = 2383^2 + 8462^2 .

It is a cyclic number.

It is not a de Polignac number, because 77284133 - 2⁶ = 77284069 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77284093 and 77284102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77284183) 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, 633416 + ... + 633537.

It is an arithmetic number, because the mean of its divisors is an integer number (19637787).

Almost surely, 2^77284133 is an apocalyptic number.

It is an amenable number.

77284133 is a deficient number, since it is larger than the sum of its proper divisors (1267015).

77284133 is a wasteful number, since it uses less digits than its factorization.

77284133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267014.

The product of its digits is 28224, while the sum is 35.

The square root of 77284133 is about 8791.1394597060. The cubic root of 77284133 is about 425.9547311695.

The spelling of 77284133 in words is "seventy-seven million, two hundred eighty-four thousand, one hundred thirty-three".