82881957438 has 96 divisors (see below), whose sum is σ = 207215154432. Its totient is φ = 23452416000.

The previous prime is 82881957421. The next prime is 82881957439. The reversal of 82881957438 is 83475918828.

82881957438 is a `hidden beast` number, since 8 + 2 + 8 + 8 + 195 + 7 + 438 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82881957439) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8627838 + ... + 8637438.

It is an arithmetic number, because the mean of its divisors is an integer number (2158491192).

Almost surely, 2^82881957438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 82881957438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103607577216).

82881957438 is an abundant number, since it is smaller than the sum of its proper divisors (124333196994).

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

82881957438 is a wasteful number, since it uses less digits than its factorization.

82881957438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10270 (or 10267 counting only the distinct ones).

The product of its digits is 30965760, while the sum is 63.

The spelling of 82881957438 in words is "eighty-two billion, eight hundred eighty-one million, nine hundred fifty-seven thousand, four hundred thirty-eight".