28506878357 has 2 divisors, whose sum is σ = 28506878358. Its totient is φ = 28506878356.

The previous prime is 28506878347. The next prime is 28506878441. The reversal of 28506878357 is 75387860582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16823646436 + 11683231921 = 129706^2 + 108089^2 .

It is a cyclic number.

It is not a de Polignac number, because 28506878357 - 2¹² = 28506874261 is a prime.

It is a super-2 number, since 2×28506878357² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28506878296 and 28506878305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28506878317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14253439178 + 14253439179.

It is an arithmetic number, because the mean of its divisors is an integer number (14253439179).

Almost surely, 2^28506878357 is an apocalyptic number.

It is an amenable number.

28506878357 is a deficient number, since it is larger than the sum of its proper divisors (1).

28506878357 is an equidigital number, since it uses as much as digits as its factorization.

28506878357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22579200, while the sum is 59.

The spelling of 28506878357 in words is "twenty-eight billion, five hundred six million, eight hundred seventy-eight thousand, three hundred fifty-seven".