28951385 has 4 divisors (see below), whose sum is σ = 34741668. Its totient is φ = 23161104.

The previous prime is 28951361. The next prime is 28951397. The reversal of 28951385 is 58315982.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58315982 = 2 ⋅29157991.

It can be written as a sum of positive squares in 2 ways, for example, as 7198489 + 21752896 = 2683^2 + 4664^2 .

It is a cyclic number.

It is not a de Polignac number, because 28951385 - 2⁸ = 28951129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2895134 + ... + 2895143.

It is an arithmetic number, because the mean of its divisors is an integer number (8685417).

Almost surely, 2^28951385 is an apocalyptic number.

It is an amenable number.

28951385 is a deficient number, since it is larger than the sum of its proper divisors (5790283).

28951385 is an equidigital number, since it uses as much as digits as its factorization.

28951385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5790282.

The product of its digits is 86400, while the sum is 41.

The square root of 28951385 is about 5380.6491244087. The cubic root of 28951385 is about 307.0599076007.

The spelling of 28951385 in words is "twenty-eight million, nine hundred fifty-one thousand, three hundred eighty-five".