28040385 has 32 divisors (see below), whose sum is σ = 46096128. Its totient is φ = 14551040.

The previous prime is 28040347. The next prime is 28040387. The reversal of 28040385 is 58304082.

It is not a de Polignac number, because 28040385 - 2¹¹ = 28038337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28040387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 120229 + ... + 120461.

It is an arithmetic number, because the mean of its divisors is an integer number (1440504).

Almost surely, 2^28040385 is an apocalyptic number.

It is an amenable number.

28040385 is a deficient number, since it is larger than the sum of its proper divisors (18055743).

28040385 is a wasteful number, since it uses less digits than its factorization.

28040385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425.

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 28040385 is about 5295.3172709480. The cubic root of 28040385 is about 303.8048182998.

The spelling of 28040385 in words is "twenty-eight million, forty thousand, three hundred eighty-five".