26831640 has 64 divisors (see below), whose sum is σ = 87816960. Its totient is φ = 6504320.

The previous prime is 26831633. The next prime is 26831653. The reversal of 26831640 is 4613862.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 26831598 and 26831607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8844 + ... + 11483.

It is an arithmetic number, because the mean of its divisors is an integer number (1372140).

Almost surely, 2^26831640 is an apocalyptic number.

26831640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26831640 is an abundant number, since it is smaller than the sum of its proper divisors (60985320).

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

26831640 is a wasteful number, since it uses less digits than its factorization.

26831640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20352 (or 20348 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 26831640 is about 5179.9266404072. The cubic root of 26831640 is about 299.3751438641.

The spelling of 26831640 in words is "twenty-six million, eight hundred thirty-one thousand, six hundred forty".