693640 has 16 divisors (see below), whose sum is σ = 1560780. Its totient is φ = 277440.

The previous prime is 693629. The next prime is 693659. The reversal of 693640 is 46396.

It can be written as a sum of positive squares in 2 ways, for example, as 675684 + 17956 = 822^2 + 134^2 .

It is a super-2 number, since 2×693640² = 962272899200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 693599 and 693608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8631 + ... + 8710.

2⁶⁹³⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

693640 is an abundant number, since it is smaller than the sum of its proper divisors (867140).

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

693640 is a wasteful number, since it uses less digits than its factorization.

693640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17352 (or 17348 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 693640 is about 832.8505268054. The cubic root of 693640 is about 88.5206735620.

The spelling of 693640 in words is "six hundred ninety-three thousand, six hundred forty".