26640157 has 4 divisors (see below), whose sum is σ = 26819100. Its totient is φ = 26461216.

The previous prime is 26640149. The next prime is 26640169. The reversal of 26640157 is 75104662.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9821956 + 16818201 = 3134^2 + 4101^2 .

It is a cyclic number.

It is not a de Polignac number, because 26640157 - 2³ = 26640149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26640127) 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, 89248 + ... + 89545.

It is an arithmetic number, because the mean of its divisors is an integer number (6704775).

Almost surely, 2^26640157 is an apocalyptic number.

It is an amenable number.

26640157 is a deficient number, since it is larger than the sum of its proper divisors (178943).

26640157 is a wasteful number, since it uses less digits than its factorization.

26640157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178942.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 26640157 is about 5161.4103692692. The cubic root of 26640157 is about 298.6612831581.

The spelling of 26640157 in words is "twenty-six million, six hundred forty thousand, one hundred fifty-seven".