28393948393040 has 40 divisors (see below), whose sum is σ = 66224182218120. Its totient is φ = 11321751021056.

The previous prime is 28393948393033. The next prime is 28393948393079. The reversal of 28393948393040 is 4039384939382.

It can be written as a sum of positive squares in 4 ways, for example, as 37769590336 + 28356178802704 = 194344^2 + 5325052^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559792235 + ... + 559842954.

It is an arithmetic number, because the mean of its divisors is an integer number (1655604555453).

Almost surely, 2^{28393948393040} is an apocalyptic number.

28393948393040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28393948393040 is an abundant number, since it is smaller than the sum of its proper divisors (37830233825080).

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

28393948393040 is a wasteful number, since it uses less digits than its factorization.

28393948393040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119635519 (or 1119635513 counting only the distinct ones).

The product of its (nonzero) digits is 120932352, while the sum is 65.

The spelling of 28393948393040 in words is "twenty-eight trillion, three hundred ninety-three billion, nine hundred forty-eight million, three hundred ninety-three thousand, forty".