28208295421 has 16 divisors (see below), whose sum is σ = 29610459648. Its totient is φ = 26821238400.

The previous prime is 28208295419. The next prime is 28208295439. The reversal of 28208295421 is 12459280282.

It is not a de Polignac number, because 28208295421 - 2¹ = 28208295419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28208295221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2868505 + ... + 2878321.

It is an arithmetic number, because the mean of its divisors is an integer number (1850653728).

Almost surely, 2^28208295421 is an apocalyptic number.

It is an amenable number.

28208295421 is a deficient number, since it is larger than the sum of its proper divisors (1402164227).

28208295421 is a wasteful number, since it uses less digits than its factorization.

28208295421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10572.

The product of its (nonzero) digits is 184320, while the sum is 43.

The spelling of 28208295421 in words is "twenty-eight billion, two hundred eight million, two hundred ninety-five thousand, four hundred twenty-one".