26640144 has 40 divisors (see below), whose sum is σ = 76468320. Its totient is φ = 8879904.

The previous prime is 26640137. The next prime is 26640149. The reversal of 26640144 is 44104662.

26640144 is a `hidden beast` number, since 2 + 6 + 640 + 14 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (26640149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30402 + ... + 31265.

It is an arithmetic number, because the mean of its divisors is an integer number (1911708).

Almost surely, 2^26640144 is an apocalyptic number.

26640144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

26640144 is an abundant number, since it is smaller than the sum of its proper divisors (49828176).

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

26640144 is a wasteful number, since it uses less digits than its factorization.

26640144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61684 (or 61672 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 26640144 is about 5161.4091099234. The cubic root of 26640144 is about 298.6612345774.

The spelling of 26640144 in words is "twenty-six million, six hundred forty thousand, one hundred forty-four".