687578481 has 24 divisors (see below), whose sum is σ = 1085520384. Its totient is φ = 417502080.

The previous prime is 687578473. The next prime is 687578483. The reversal of 687578481 is 184875786.

It is a happy number.

687578481 is a `hidden beast` number, since 68 + 7 + 578 + 4 + 8 + 1 = 666.

It is not a de Polignac number, because 687578481 - 2³ = 687578473 is a prime.

It is a super-2 number, since 2×687578481² = 945528335068534722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (687578483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67741 + ... + 77226.

It is an arithmetic number, because the mean of its divisors is an integer number (45230016).

Almost surely, 2^687578481 is an apocalyptic number.

It is an amenable number.

687578481 is a deficient number, since it is larger than the sum of its proper divisors (397941903).

687578481 is a wasteful number, since it uses less digits than its factorization.

687578481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145021 (or 145018 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The square root of 687578481 is about 26221.7177354955. The cubic root of 687578481 is about 882.6206662225.

The spelling of 687578481 in words is "six hundred eighty-seven million, five hundred seventy-eight thousand, four hundred eighty-one".