77009393 has 4 divisors (see below), whose sum is σ = 77454708. Its totient is φ = 76564080.

The previous prime is 77009353. The next prime is 77009411. The reversal of 77009393 is 39390077.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39390077 = 53 ⋅743209.

It can be written as a sum of positive squares in 2 ways, for example, as 72880369 + 4129024 = 8537^2 + 2032^2 .

It is a cyclic number.

It is not a de Polignac number, because 77009393 - 2¹² = 77005297 is a prime.

It is a super-2 number, since 2×77009393² = 11860893220456898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77009323) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 222398 + ... + 222743.

It is an arithmetic number, because the mean of its divisors is an integer number (19363677).

Almost surely, 2^77009393 is an apocalyptic number.

It is an amenable number.

77009393 is a deficient number, since it is larger than the sum of its proper divisors (445315).

77009393 is a wasteful number, since it uses less digits than its factorization.

77009393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445314.

The product of its (nonzero) digits is 35721, while the sum is 38.

The square root of 77009393 is about 8775.4995869181. The cubic root of 77009393 is about 425.4493848713.

The spelling of 77009393 in words is "seventy-seven million, nine thousand, three hundred ninety-three".