1028455421640 has 128 divisors (see below), whose sum is σ = 3144524544000. Its totient is φ = 269030539008.

The previous prime is 1028455421551. The next prime is 1028455421683. The reversal of 1028455421640 is 461245548201.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1028455421592 and 1028455421601.

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, 1653951 + ... + 2189169.

It is an arithmetic number, because the mean of its divisors is an integer number (24566598000).

Almost surely, 2^{1028455421640} is an apocalyptic number.

1028455421640 is a gapful number since it is divisible by the number (10) 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 1028455421640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1572262272000).

1028455421640 is an abundant number, since it is smaller than the sum of its proper divisors (2116069122360).

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

1028455421640 is a wasteful number, since it uses less digits than its factorization.

1028455421640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535539 (or 535535 counting only the distinct ones).

The product of its (nonzero) digits is 307200, while the sum is 42.

The spelling of 1028455421640 in words is "one trillion, twenty-eight billion, four hundred fifty-five million, four hundred twenty-one thousand, six hundred forty".