76781540 has 24 divisors (see below), whose sum is σ = 175900032. Its totient is φ = 27920480.

The previous prime is 76781519. The next prime is 76781569. The reversal of 76781540 is 4518767.

It is a junction number, because it is equal to n+sod(n) for n = 76781494 and 76781503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174284 + ... + 174723.

It is an arithmetic number, because the mean of its divisors is an integer number (7329168).

Almost surely, 2^76781540 is an apocalyptic number.

It is an amenable number.

76781540 is an abundant number, since it is smaller than the sum of its proper divisors (99118492).

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

76781540 is a wasteful number, since it uses less digits than its factorization.

76781540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349027 (or 349025 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 76781540 is about 8762.5076319510. The cubic root of 76781540 is about 425.0293682128.

The spelling of 76781540 in words is "seventy-six million, seven hundred eighty-one thousand, five hundred forty".