28285051 has 12 divisors (see below), whose sum is σ = 29778112. Its totient is φ = 26838000.

The previous prime is 28285031. The next prime is 28285069. The reversal of 28285051 is 15058282.

It is not a de Polignac number, because 28285051 - 2¹⁹ = 27760763 is a prime.

It is a super-2 number, since 2×28285051² = 1600088220145202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28285021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156181 + ... + 156361.

Almost surely, 2^28285051 is an apocalyptic number.

28285051 is a deficient number, since it is larger than the sum of its proper divisors (1493061).

28285051 is an equidigital number, since it uses as much as digits as its factorization.

28285051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 354 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 28285051 is about 5318.3692049349. The cubic root of 28285051 is about 304.6858756398.

The spelling of 28285051 in words is "twenty-eight million, two hundred eighty-five thousand, fifty-one".