28010105780 has 24 divisors (see below), whose sum is σ = 59403614760. Its totient is φ = 11093110400.

The previous prime is 28010105771. The next prime is 28010105789. The reversal of 28010105780 is 8750101082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28010105771) and next prime (28010105789).

It can be written as a sum of positive squares in 4 ways, for example, as 12285948964 + 15724156816 = 110842^2 + 125396^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28010105789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6931175 + ... + 6935214.

It is an arithmetic number, because the mean of its divisors is an integer number (2475150615).

Almost surely, 2^28010105780 is an apocalyptic number.

28010105780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28010105780 is an abundant number, since it is smaller than the sum of its proper divisors (31393508980).

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

28010105780 is a wasteful number, since it uses less digits than its factorization.

28010105780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13866499 (or 13866497 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 32.

The spelling of 28010105780 in words is "twenty-eight billion, ten million, one hundred five thousand, seven hundred eighty".