245241640 has 128 divisors (see below), whose sum is σ = 665832960. Its totient is φ = 79478784.

The previous prime is 245241637. The next prime is 245241697. The reversal of 245241640 is 46142542.

245241640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 245241599 and 245241608.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 727552 + ... + 727888.

It is an arithmetic number, because the mean of its divisors is an integer number (5201820).

Almost surely, 2^245241640 is an apocalyptic number.

245241640 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 245241640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332916480).

245241640 is an abundant number, since it is smaller than the sum of its proper divisors (420591320).

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

245241640 is a wasteful number, since it uses less digits than its factorization.

245241640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 28.

The square root of 245241640 is about 15660.1928468330. The cubic root of 245241640 is about 625.9381239729.

The spelling of 245241640 in words is "two hundred forty-five million, two hundred forty-one thousand, six hundred forty".