28002778007 has 4 divisors (see below), whose sum is σ = 28004329080. Its totient is φ = 28001226936.

The previous prime is 28002777977. The next prime is 28002778019. The reversal of 28002778007 is 70087720082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70087720082 = 2 ⋅35043860041.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28002778007 is a prime.

It is a super-2 number, since 2×28002778007² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28002798007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 748133 + ... + 784670.

It is an arithmetic number, because the mean of its divisors is an integer number (7001082270).

Almost surely, 2^28002778007 is an apocalyptic number.

28002778007 is a deficient number, since it is larger than the sum of its proper divisors (1551073).

28002778007 is a wasteful number, since it uses less digits than its factorization.

28002778007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551072.

The product of its (nonzero) digits is 87808, while the sum is 41.

The spelling of 28002778007 in words is "twenty-eight billion, two million, seven hundred seventy-eight thousand, seven".