28778351837 has 2 divisors, whose sum is σ = 28778351838. Its totient is φ = 28778351836.

The previous prime is 28778351827. The next prime is 28778351851. The reversal of 28778351837 is 73815387782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21905776036 + 6872575801 = 148006^2 + 82901^2 .

It is a cyclic number.

It is not a de Polignac number, because 28778351837 - 2¹⁶ = 28778286301 is a prime.

It is a super-2 number, since 2×28778351837² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28778351827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14389175918 + 14389175919.

It is an arithmetic number, because the mean of its divisors is an integer number (14389175919).

Almost surely, 2^28778351837 is an apocalyptic number.

It is an amenable number.

28778351837 is a deficient number, since it is larger than the sum of its proper divisors (1).

28778351837 is an equidigital number, since it uses as much as digits as its factorization.

28778351837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15805440, while the sum is 59.

The spelling of 28778351837 in words is "twenty-eight billion, seven hundred seventy-eight million, three hundred fifty-one thousand, eight hundred thirty-seven".