28421646 has 32 divisors (see below), whose sum is σ = 62246016. Its totient is φ = 8580000.

The previous prime is 28421639. The next prime is 28421681. The reversal of 28421646 is 64612482.

It is a super-2 number, since 2×28421646² = 1615579922698632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21196 + ... + 22496.

It is an arithmetic number, because the mean of its divisors is an integer number (1945188).

Almost surely, 2^28421646 is an apocalyptic number.

28421646 is an abundant number, since it is smaller than the sum of its proper divisors (33824370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28421646 is a wasteful number, since it uses less digits than its factorization.

28421646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648.

The product of its digits is 18432, while the sum is 33.

The square root of 28421646 is about 5331.1955507184. The cubic root of 28421646 is about 305.1755542236.

The spelling of 28421646 in words is "twenty-eight million, four hundred twenty-one thousand, six hundred forty-six".