26640728 has 16 divisors (see below), whose sum is σ = 51014880. Its totient is φ = 13036768.

The previous prime is 26640721. The next prime is 26640743. The reversal of 26640728 is 82704662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26640721) 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, 35051 + ... + 35802.

It is an arithmetic number, because the mean of its divisors is an integer number (3188430).

Almost surely, 2^26640728 is an apocalyptic number.

It is an amenable number.

26640728 is a deficient number, since it is larger than the sum of its proper divisors (24374152).

26640728 is a wasteful number, since it uses less digits than its factorization.

26640728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70906 (or 70902 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 26640728 is about 5161.4656833113. The cubic root of 26640728 is about 298.6634169590.

The spelling of 26640728 in words is "twenty-six million, six hundred forty thousand, seven hundred twenty-eight".