26640730 has 8 divisors (see below), whose sum is σ = 47953332. Its totient is φ = 10656288.

The previous prime is 26640721. The next prime is 26640743. The reversal of 26640730 is 3704662.

It can be written as a sum of positive squares in 2 ways, for example, as 25010001 + 1630729 = 5001^2 + 1277^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332027 + ... + 1332046.

Almost surely, 2^26640730 is an apocalyptic number.

26640730 is a deficient number, since it is larger than the sum of its proper divisors (21312602).

26640730 is a wasteful number, since it uses less digits than its factorization.

26640730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664080.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 26640730 is about 5161.4658770547. The cubic root of 26640730 is about 298.6634244329.

The spelling of 26640730 in words is "twenty-six million, six hundred forty thousand, seven hundred thirty".