76839540 has 24 divisors (see below), whose sum is σ = 215150880. Its totient is φ = 20490528.

The previous prime is 76839533. The next prime is 76839551. The reversal of 76839540 is 4593867.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 76839492 and 76839501.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 640270 + ... + 640389.

It is an arithmetic number, because the mean of its divisors is an integer number (8964620).

Almost surely, 2^76839540 is an apocalyptic number.

It is an amenable number.

76839540 is an abundant number, since it is smaller than the sum of its proper divisors (138311340).

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

76839540 is a wasteful number, since it uses less digits than its factorization.

76839540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280671 (or 1280669 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 76839540 is about 8765.8165620779. The cubic root of 76839540 is about 425.1363622409.

The spelling of 76839540 in words is "seventy-six million, eight hundred thirty-nine thousand, five hundred forty".