41978064640 has 144 divisors (see below), whose sum is σ = 106709309280. Its totient is φ = 15767306240.

The previous prime is 41978064593. The next prime is 41978064649. The reversal of 41978064640 is 4646087914.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41978064649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10682196 + ... + 10686124.

It is an arithmetic number, because the mean of its divisors is an integer number (741036870).

Almost surely, 2^41978064640 is an apocalyptic number.

41978064640 is a gapful number since it is divisible by the number (40) 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 41978064640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53354654640).

41978064640 is an abundant number, since it is smaller than the sum of its proper divisors (64731244640).

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

41978064640 is a wasteful number, since it uses less digits than its factorization.

41978064640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4458 (or 4444 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 41978064640 in words is "forty-one billion, nine hundred seventy-eight million, sixty-four thousand, six hundred forty".