26640530 has 64 divisors (see below), whose sum is σ = 59139072. Its totient is φ = 8432640.

The previous prime is 26640511. The next prime is 26640533. The reversal of 26640530 is 3504662.

It is a self number, because there is not a number n which added to its sum of digits gives 26640530.

It is not an unprimeable number, because it can be changed into a prime (26640533) 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, 72407 + ... + 72773.

It is an arithmetic number, because the mean of its divisors is an integer number (924048).

Almost surely, 2^26640530 is an apocalyptic number.

26640530 is an abundant number, since it is smaller than the sum of its proper divisors (32498542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26640530 is a wasteful number, since it uses less digits than its factorization.

26640530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 26640530 is about 5161.4465026773. The cubic root of 26640530 is about 298.6626770455.

The spelling of 26640530 in words is "twenty-six million, six hundred forty thousand, five hundred thirty".