77408442 has 24 divisors (see below), whose sum is σ = 168004980. Its totient is φ = 25758720.

The previous prime is 77408437. The next prime is 77408447. The reversal of 77408442 is 24480477.

It is an interprime number because it is at equal distance from previous prime (77408437) and next prime (77408447).

It can be written as a sum of positive squares in 2 ways, for example, as 69906321 + 7502121 = 8361^2 + 2739^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77408397 and 77408406.

It is not an unprimeable number, because it can be changed into a prime (77408447) 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 11 ways as a sum of consecutive naturals, for example, 8184 + ... + 14892.

Almost surely, 2^77408442 is an apocalyptic number.

77408442 is an abundant number, since it is smaller than the sum of its proper divisors (90596538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77408442 is a wasteful number, since it uses less digits than its factorization.

77408442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7358 (or 7355 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 36.

The square root of 77408442 is about 8798.2067491052. The cubic root of 77408442 is about 426.1829869166.

The spelling of 77408442 in words is "seventy-seven million, four hundred eight thousand, four hundred forty-two".