28621408 has 12 divisors (see below), whose sum is σ = 56348460. Its totient is φ = 14310688.

The previous prime is 28621399. The next prime is 28621427. The reversal of 28621408 is 80412682.

It is a self number, because there is not a number n which added to its sum of digits gives 28621408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 447178 + ... + 447241.

It is an arithmetic number, because the mean of its divisors is an integer number (4695705).

Almost surely, 2^28621408 is an apocalyptic number.

It is an amenable number.

28621408 is a deficient number, since it is larger than the sum of its proper divisors (27727052).

28621408 is an equidigital number, since it uses as much as digits as its factorization.

28621408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894429 (or 894421 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 28621408 is about 5349.8979429518. The cubic root of 28621408 is about 305.8888627690. Note that the first 4 decimals are identical.

The spelling of 28621408 in words is "twenty-eight million, six hundred twenty-one thousand, four hundred eight".