26493640 has 32 divisors (see below), whose sum is σ = 60740280. Its totient is φ = 10396672.

The previous prime is 26493629. The next prime is 26493653. The reversal of 26493640 is 4639462.

It can be written as a sum of positive squares in 4 ways, for example, as 23677956 + 2815684 = 4866^2 + 1678^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26493596 and 26493605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4129 + ... + 8368.

Almost surely, 2^26493640 is an apocalyptic number.

26493640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26493640 is an abundant number, since it is smaller than the sum of its proper divisors (34246640).

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

26493640 is a wasteful number, since it uses less digits than its factorization.

26493640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12561 (or 12557 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 26493640 is about 5147.1972956163. The cubic root of 26493640 is about 298.1127450510.

The spelling of 26493640 in words is "twenty-six million, four hundred ninety-three thousand, six hundred forty".