28421919 has 6 divisors (see below), whose sum is σ = 41053896. Its totient is φ = 18947940.

The previous prime is 28421917. The next prime is 28421927. The reversal of 28421919 is 91912482.

It is not a de Polignac number, because 28421919 - 2¹ = 28421917 is a prime.

It is a super-2 number, since 2×28421919² = 1615610959285122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28421917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1578987 + ... + 1579004.

It is an arithmetic number, because the mean of its divisors is an integer number (6842316).

Almost surely, 2^28421919 is an apocalyptic number.

28421919 is a deficient number, since it is larger than the sum of its proper divisors (12631977).

28421919 is a wasteful number, since it uses less digits than its factorization.

28421919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157997 (or 3157994 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 28421919 is about 5331.2211546699. The cubic root of 28421919 is about 305.1765313270.

It can be divided in two parts, 2842 and 1919, that added together give a square (4761 = 69²).

The spelling of 28421919 in words is "twenty-eight million, four hundred twenty-one thousand, nine hundred nineteen".