207970640 has 20 divisors (see below), whose sum is σ = 483531924. Its totient is φ = 83188224.

The previous prime is 207970621. The next prime is 207970643. The reversal of 207970640 is 46079702.

It can be written as a sum of positive squares in 2 ways, for example, as 162919696 + 45050944 = 12764^2 + 6712^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 207970640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (207970643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1299737 + ... + 1299896.

Almost surely, 2^207970640 is an apocalyptic number.

207970640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

207970640 is an abundant number, since it is smaller than the sum of its proper divisors (275561284).

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

207970640 is a wasteful number, since it uses less digits than its factorization.

207970640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599646 (or 2599640 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 207970640 is about 14421.1871910741. The cubic root of 207970640 is about 592.4713345221.

The spelling of 207970640 in words is "two hundred seven million, nine hundred seventy thousand, six hundred forty".