26406681 has 8 divisors (see below), whose sum is σ = 40238784. Its totient is φ = 15089520.

The previous prime is 26406673. The next prime is 26406697. The reversal of 26406681 is 18660462.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 26406681 - 2³ = 26406673 is a prime.

It is a super-2 number, since 2×26406681² = 1394625602871522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26406671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628710 + ... + 628751.

It is an arithmetic number, because the mean of its divisors is an integer number (5029848).

Almost surely, 2^26406681 is an apocalyptic number.

26406681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

26406681 is a deficient number, since it is larger than the sum of its proper divisors (13832103).

26406681 is a wasteful number, since it uses less digits than its factorization.

26406681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257471.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 26406681 is about 5138.7431342693. The cubic root of 26406681 is about 297.7862264265.

The spelling of 26406681 in words is "twenty-six million, four hundred six thousand, six hundred eighty-one".