28002777993 has 12 divisors (see below), whose sum is σ = 40841161920. Its totient is φ = 18487270296.

The previous prime is 28002777977. The next prime is 28002778019. The reversal of 28002777993 is 39977720082.

28002777993 is a `hidden beast` number, since 280 + 0 + 277 + 7 + 9 + 93 = 666.

It is not a de Polignac number, because 28002777993 - 2⁴ = 28002777977 is a prime.

It is a super-3 number, since 3×28002777993³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28002777793) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15103053 + ... + 15104906.

It is an arithmetic number, because the mean of its divisors is an integer number (3403430160).

Almost surely, 2^28002777993 is an apocalyptic number.

It is an amenable number.

28002777993 is a deficient number, since it is larger than the sum of its proper divisors (12838383927).

28002777993 is a wasteful number, since it uses less digits than its factorization.

28002777993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30208068 (or 30208065 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The spelling of 28002777993 in words is "twenty-eight billion, two million, seven hundred seventy-seven thousand, nine hundred ninety-three".