28040707 has 4 divisors (see below), whose sum is σ = 28055416. Its totient is φ = 28026000.

The previous prime is 28040699. The next prime is 28040729. The reversal of 28040707 is 70704082.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70704082 = 2 ⋅35352041.

It is a cyclic number.

It is not a de Polignac number, because 28040707 - 2³ = 28040699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28040407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3978 + ... + 8479.

It is an arithmetic number, because the mean of its divisors is an integer number (7013854).

Almost surely, 2^28040707 is an apocalyptic number.

28040707 is a deficient number, since it is larger than the sum of its proper divisors (14709).

28040707 is a wasteful number, since it uses less digits than its factorization.

28040707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14708.

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 28040707 is about 5295.3476750823. The cubic root of 28040707 is about 303.8059812032.

Adding to 28040707 its reverse (70704082), we get a palindrome (98744789).

The spelling of 28040707 in words is "twenty-eight million, forty thousand, seven hundred seven".