28356904437 has 16 divisors (see below), whose sum is σ = 38230856832. Its totient is φ = 18694103040.

The previous prime is 28356904421. The next prime is 28356904489. The reversal of 28356904437 is 73440965382.

It is not a de Polignac number, because 28356904437 - 2⁴ = 28356904421 is a prime.

It is a super-2 number, since 2×28356904437² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28356904437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28356909437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314112 + ... + 394182.

It is an arithmetic number, because the mean of its divisors is an integer number (2389428552).

Almost surely, 2^28356904437 is an apocalyptic number.

It is an amenable number.

28356904437 is a deficient number, since it is larger than the sum of its proper divisors (9873952395).

28356904437 is a wasteful number, since it uses less digits than its factorization.

28356904437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81388.

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 28356904437 in words is "twenty-eight billion, three hundred fifty-six million, nine hundred four thousand, four hundred thirty-seven".