39781025648 has 160 divisors (see below), whose sum is σ = 101551833600. Its totient is φ = 14655955968.

The previous prime is 39781025639. The next prime is 39781025657. The reversal of 39781025648 is 84652018793.

It is an interprime number because it is at equal distance from previous prime (39781025639) and next prime (39781025657).

It is a self number, because there is not a number n which added to its sum of digits gives 39781025648.

It is a congruent number.

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, 1619990 + ... + 1644362.

It is an arithmetic number, because the mean of its divisors is an integer number (634698960).

It is a 1-persistent number, because it is pandigital, but 2⋅39781025648 = 79562051296 is not.

Almost surely, 2^39781025648 is an apocalyptic number.

39781025648 is a gapful number since it is divisible by the number (38) 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 39781025648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50775916800).

39781025648 is an abundant number, since it is smaller than the sum of its proper divisors (61770807952).

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

39781025648 is a wasteful number, since it uses less digits than its factorization.

39781025648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24479 (or 24473 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 53.

The spelling of 39781025648 in words is "thirty-nine billion, seven hundred eighty-one million, twenty-five thousand, six hundred forty-eight".