1001000028402 has 80 divisors (see below), whose sum is σ = 2450433056544. Its totient is φ = 302893992000.

The previous prime is 1001000028401. The next prime is 1001000028433. The reversal of 1001000028402 is 2048200001001.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1001000028401) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 824902 + ... + 1637822.

Almost surely, 2^{1001000028402} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1001000028402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1225216528272).

1001000028402 is an abundant number, since it is smaller than the sum of its proper divisors (1449433028142).

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

1001000028402 is a wasteful number, since it uses less digits than its factorization.

1001000028402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813637 (or 813628 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1001000028402 its reverse (2048200001001), we get a palindrome (3049200029403).

The spelling of 1001000028402 in words is "one trillion, one billion, twenty-eight thousand, four hundred two".