1968254640 has 400 divisors, whose sum is σ = 7612789536. Its totient is φ = 467251200.

The previous prime is 1968254599. The next prime is 1968254641. The reversal of 1968254640 is 464528691.

1968254640 is a `hidden beast` number, since 1 + 9 + 68 + 2 + 546 + 40 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1968254641) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3777580 + ... + 3778100.

Almost surely, 2^1968254640 is an apocalyptic number.

1968254640 is a gapful number since it is divisible by the number (10) 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 1968254640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3806394768).

1968254640 is an abundant number, since it is smaller than the sum of its proper divisors (5644534896).

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

1968254640 is a wasteful number, since it uses less digits than its factorization.

1968254640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 595 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 1968254640 is about 44365.0159472529. The cubic root of 1968254640 is about 1253.2193580024.

The spelling of 1968254640 in words is "one billion, nine hundred sixty-eight million, two hundred fifty-four thousand, six hundred forty".