26640993 has 16 divisors (see below), whose sum is σ = 36279360. Its totient is φ = 17385984.

The previous prime is 26640973. The next prime is 26641001. The reversal of 26640993 is 39904662.

It is a happy number.

It is not a de Polignac number, because 26640993 - 2¹⁶ = 26575457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26640973) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29730 + ... + 30612.

It is an arithmetic number, because the mean of its divisors is an integer number (2267460).

Almost surely, 2^26640993 is an apocalyptic number.

It is an amenable number.

26640993 is a deficient number, since it is larger than the sum of its proper divisors (9638367).

26640993 is a wasteful number, since it uses less digits than its factorization.

26640993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 26640993 is about 5161.4913542502. The cubic root of 26640993 is about 298.6644072416.

The spelling of 26640993 in words is "twenty-six million, six hundred forty thousand, nine hundred ninety-three".