7280040400728 has 32 divisors (see below), whose sum is σ = 18380300027760. Its totient is φ = 2402653596800.

The previous prime is 7280040400687. The next prime is 7280040400741. The reversal of 7280040400728 is 8270040400827.

It is a super-3 number, since 3×7280040400728³ (a number of 40 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7280040400728.

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, 1501656075 + ... + 1501660922.

Almost surely, 2^{7280040400728} is an apocalyptic number.

It is an amenable number.

7280040400728 is an abundant number, since it is smaller than the sum of its proper divisors (11100259627032).

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

7280040400728 is a wasteful number, since it uses less digits than its factorization.

7280040400728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003317107 (or 3003317103 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 42.

Subtracting 7280040400728 from its reverse (8270040400827), we obtain a palindrome (990000000099).

The spelling of 7280040400728 in words is "seven trillion, two hundred eighty billion, forty million, four hundred thousand, seven hundred twenty-eight".