28742385 has 32 divisors (see below), whose sum is σ = 52780032. Its totient is φ = 13083840.

The previous prime is 28742369. The next prime is 28742401. The reversal of 28742385 is 58324782.

It is an interprime number because it is at equal distance from previous prime (28742369) and next prime (28742401).

It is not a de Polignac number, because 28742385 - 2⁴ = 28742369 is a prime.

It is a super-2 number, since 2×28742385² = 1652249390976450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34342 + ... + 35168.

It is an arithmetic number, because the mean of its divisors is an integer number (1649376).

Almost surely, 2^28742385 is an apocalyptic number.

It is an amenable number.

28742385 is a deficient number, since it is larger than the sum of its proper divisors (24037647).

28742385 is a wasteful number, since it uses less digits than its factorization.

28742385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173.

The product of its digits is 107520, while the sum is 39.

The square root of 28742385 is about 5361.1924979430. The cubic root of 28742385 is about 306.3192341041.

The spelling of 28742385 in words is "twenty-eight million, seven hundred forty-two thousand, three hundred eighty-five".