2398256640 has 640 divisors, whose sum is σ = 9775624320. Its totient is φ = 552075264.

The previous prime is 2398256633. The next prime is 2398256671. The reversal of 2398256640 is 466528932.

2398256640 is a `hidden beast` number, since 2 + 3 + 9 + 82 + 566 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a super-2 number, since 2×2398256640² = 11503269822608179200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15275442 + ... + 15275598.

It is an arithmetic number, because the mean of its divisors is an integer number (15274413).

Almost surely, 2^2398256640 is an apocalyptic number.

2398256640 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 2398256640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4887812160).

2398256640 is an abundant number, since it is smaller than the sum of its proper divisors (7377367680).

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

2398256640 is a wasteful number, since it uses less digits than its factorization.

2398256640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 2398256640 is about 48971.9985297721. The cubic root of 2398256640 is about 1338.5416375736.

The spelling of 2398256640 in words is "two billion, three hundred ninety-eight million, two hundred fifty-six thousand, six hundred forty".