77408443 has 4 divisors (see below), whose sum is σ = 88466800. Its totient is φ = 66350088.

The previous prime is 77408437. The next prime is 77408447. The reversal of 77408443 is 34480477.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34480477 = 3539 ⋅9743.

It is not a de Polignac number, because 77408443 - 2¹⁷ = 77277371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77408447) 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, 5529168 + ... + 5529181.

It is an arithmetic number, because the mean of its divisors is an integer number (22116700).

Almost surely, 2^77408443 is an apocalyptic number.

77408443 is a deficient number, since it is larger than the sum of its proper divisors (11058357).

77408443 is a wasteful number, since it uses less digits than its factorization.

77408443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11058356.

The product of its (nonzero) digits is 75264, while the sum is 37.

The square root of 77408443 is about 8798.2068059349. The cubic root of 77408443 is about 426.1829887518.

The spelling of 77408443 in words is "seventy-seven million, four hundred eight thousand, four hundred forty-three".