26831661 has 16 divisors (see below), whose sum is σ = 38404224. Its totient is φ = 16602624.

The previous prime is 26831657. The next prime is 26831663. The reversal of 26831661 is 16613862.

It is not a de Polignac number, because 26831661 - 2² = 26831657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26831663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120 + ... + 7326.

It is an arithmetic number, because the mean of its divisors is an integer number (2400264).

Almost surely, 2^26831661 is an apocalyptic number.

It is an amenable number.

26831661 is a deficient number, since it is larger than the sum of its proper divisors (11572563).

26831661 is a wasteful number, since it uses less digits than its factorization.

26831661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7300.

The product of its digits is 10368, while the sum is 33.

The square root of 26831661 is about 5179.9286674625. The cubic root of 26831661 is about 299.3752219668.

The spelling of 26831661 in words is "twenty-six million, eight hundred thirty-one thousand, six hundred sixty-one".