26640146 has 24 divisors (see below), whose sum is σ = 43579620. Its totient is φ = 12207936.

The previous prime is 26640137. The next prime is 26640149. The reversal of 26640146 is 64104662.

It can be written as a sum of positive squares in 6 ways, for example, as 4182025 + 22458121 = 2045^2 + 4739^2 .

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90776 + ... + 91068.

Almost surely, 2^26640146 is an apocalyptic number.

26640146 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

26640146 is a deficient number, since it is larger than the sum of its proper divisors (16939474).

26640146 is a wasteful number, since it uses less digits than its factorization.

26640146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590 (or 577 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 26640146 is about 5161.4093036689. The cubic root of 26640146 is about 298.6612420513.

The spelling of 26640146 in words is "twenty-six million, six hundred forty thousand, one hundred forty-six".