71428381020 has 144 divisors (see below), whose sum is σ = 222142912992. Its totient is φ = 18567843840.

The previous prime is 71428381001. The next prime is 71428381021. The reversal of 71428381020 is 2018382417.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71428381021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4023684 + ... + 4041396.

It is an arithmetic number, because the mean of its divisors is an integer number (1542659118).

Almost surely, 2^71428381020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71428381020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111071456496).

71428381020 is an abundant number, since it is smaller than the sum of its proper divisors (150714531972).

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

71428381020 is a wasteful number, since it uses less digits than its factorization.

71428381020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18292 (or 18287 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 71428381020 in words is "seventy-one billion, four hundred twenty-eight million, three hundred eighty-one thousand, twenty".