28509062421 has 16 divisors (see below), whose sum is σ = 43582076928. Its totient is φ = 16238506800.

The previous prime is 28509062401. The next prime is 28509062429. The reversal of 28509062421 is 12426090582.

It is not a de Polignac number, because 28509062421 - 2⁷ = 28509062293 is a prime.

It is a super-3 number, since 3×28509062421³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28509062421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28509062429) 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, 2176065 + ... + 2189126.

It is an arithmetic number, because the mean of its divisors is an integer number (2723879808).

Almost surely, 2^28509062421 is an apocalyptic number.

28509062421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28509062421 is a deficient number, since it is larger than the sum of its proper divisors (15073014507).

28509062421 is a wasteful number, since it uses less digits than its factorization.

28509062421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4365512.

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 28509062421 in words is "twenty-eight billion, five hundred nine million, sixty-two thousand, four hundred twenty-one".