28020355 has 16 divisors (see below), whose sum is σ = 36784224. Its totient is φ = 20321280.

The previous prime is 28020341. The next prime is 28020361. The reversal of 28020355 is 55302082.

It is not a de Polignac number, because 28020355 - 2⁵ = 28020323 is a prime.

It is a Duffinian 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, 36637 + ... + 37393.

It is an arithmetic number, because the mean of its divisors is an integer number (2299014).

Almost surely, 2^28020355 is an apocalyptic number.

28020355 is a deficient number, since it is larger than the sum of its proper divisors (8763869).

28020355 is a wasteful number, since it uses less digits than its factorization.

28020355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1446.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 28020355 is about 5293.4256394135. The cubic root of 28020355 is about 303.7324624218.

The spelling of 28020355 in words is "twenty-eight million, twenty thousand, three hundred fifty-five".