507681 has 8 divisors (see below), whose sum is σ = 752160. Its totient is φ = 338436.

The previous prime is 507673. The next prime is 507691. The reversal of 507681 is 186705.

507681 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 507681 - 2³ = 507673 is a prime.

It is a super-2 number, since 2×507681² = 515479995522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 18803 = 507681 / (5 + 0 + 7 + 6 + 8 + 1).

507681 is strictly pandigital in base 7.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (507631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9375 + ... + 9428.

It is an arithmetic number, because the mean of its divisors is an integer number (94020).

2⁵⁰⁷⁶⁸¹ is an apocalyptic number.

It is an amenable number.

507681 is a deficient number, since it is larger than the sum of its proper divisors (244479).

507681 is a wasteful number, since it uses less digits than its factorization.

507681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18812 (or 18806 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 507681 is about 712.5173682094. The cubic root of 507681 is about 79.7744165827.

The spelling of 507681 in words is "five hundred seven thousand, six hundred eighty-one".