245840720 has 30 divisors (see below), whose sum is σ = 571905918. Its totient is φ = 98280192.

The previous prime is 245840717. The next prime is 245840729. The reversal of 245840720 is 27048542.

It can be written as a sum of positive squares in 3 ways, for example, as 20720704 + 225120016 = 4552^2 + 15004^2 .

It is a super-2 number, since 2×245840720² = 120875319220236800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245840729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 139364 + ... + 141116.

Almost surely, 2^245840720 is an apocalyptic number.

245840720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245840720 is an abundant number, since it is smaller than the sum of its proper divisors (326065198).

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

245840720 is an frugal number, since it uses more digits than its factorization.

245840720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519 (or 1760 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 245840720 is about 15679.3086582285. The cubic root of 245840720 is about 626.4473932304.

The spelling of 245840720 in words is "two hundred forty-five million, eight hundred forty thousand, seven hundred twenty".