245687840 has 48 divisors (see below), whose sum is σ = 605683008. Its totient is φ = 94000896.

The previous prime is 245687839. The next prime is 245687843. The reversal of 245687840 is 48786542.

It is a junction number, because it is equal to n+sod(n) for n = 245687791 and 245687800.

It is not an unprimeable number, because it can be changed into a prime (245687843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29702 + ... + 37061.

It is an arithmetic number, because the mean of its divisors is an integer number (12618396).

Almost surely, 2^245687840 is an apocalyptic number.

245687840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

245687840 is an abundant number, since it is smaller than the sum of its proper divisors (359995168).

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

245687840 is a wasteful number, since it uses less digits than its factorization.

245687840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66801 (or 66793 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 44.

The square root of 245687840 is about 15674.4326851086. The cubic root of 245687840 is about 626.3175108460.

The spelling of 245687840 in words is "two hundred forty-five million, six hundred eighty-seven thousand, eight hundred forty".