6985640 has 32 divisors (see below), whose sum is σ = 16643880. Its totient is φ = 2629632.

The previous prime is 6985639. The next prime is 6985679. The reversal of 6985640 is 465896.

It can be written as a sum of positive squares in 4 ways, for example, as 5597956 + 1387684 = 2366^2 + 1178^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6985594 and 6985603.

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, 4457 + ... + 5816.

Almost surely, 2^6985640 is an apocalyptic number.

It is an amenable number.

6985640 is an abundant number, since it is smaller than the sum of its proper divisors (9658240).

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

6985640 is a wasteful number, since it uses less digits than its factorization.

6985640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10301 (or 10297 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 6985640 is about 2643.0361329350. The cubic root of 6985640 is about 191.1622206712.

It can be divided in two parts, 69856 and 40, that added together give a palindrome (69896).

The spelling of 6985640 in words is "six million, nine hundred eighty-five thousand, six hundred forty".