981400028 has 72 divisors (see below), whose sum is σ = 2046506112. Its totient is φ = 410489856.

The previous prime is 981400003. The next prime is 981400037. The reversal of 981400028 is 820004189.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 981399967 and 981400003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1616501 + ... + 1617107.

It is an arithmetic number, because the mean of its divisors is an integer number (28423696).

Almost surely, 2^981400028 is an apocalyptic number.

981400028 is a gapful number since it is divisible by the number (98) 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 981400028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023253056).

981400028 is an abundant number, since it is smaller than the sum of its proper divisors (1065106084).

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

981400028 is a wasteful number, since it uses less digits than its factorization.

981400028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 981400028 is about 31327.3048314087. The cubic root of 981400028 is about 993.7611672439.

The spelling of 981400028 in words is "nine hundred eighty-one million, four hundred thousand, twenty-eight".