207800640 has 140 divisors (see below), whose sum is σ = 739275636. Its totient is φ = 55406592.

The previous prime is 207800633. The next prime is 207800683. The reversal of 207800640 is 46008702.

It can be written as a sum of positive squares in 2 ways, for example, as 97298496 + 110502144 = 9864^2 + 10512^2 .

It is a super-2 number, since 2×207800640² = 86362211968819200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21912 + ... + 29928.

Almost surely, 2^207800640 is an apocalyptic number.

207800640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 207800640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (369637818).

207800640 is an abundant number, since it is smaller than the sum of its proper divisors (531474996).

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

207800640 is an equidigital number, since it uses as much as digits as its factorization.

207800640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8046 (or 8027 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 207800640 is about 14415.2918804997. The cubic root of 207800640 is about 592.3098572690.

The spelling of 207800640 in words is "two hundred seven million, eight hundred thousand, six hundred forty".