26401781 has 8 divisors (see below), whose sum is σ = 30290304. Its totient is φ = 22542480.

The previous prime is 26401777. The next prime is 26401783. The reversal of 26401781 is 18710462.

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

It is a cyclic number.

It is not a de Polignac number, because 26401781 - 2² = 26401777 is a prime.

It is a super-2 number, since 2×26401781² = 1394108079943922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26401783) 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, 5330 + ... + 9011.

It is an arithmetic number, because the mean of its divisors is an integer number (3786288).

Almost surely, 2^26401781 is an apocalyptic number.

It is an amenable number.

26401781 is a deficient number, since it is larger than the sum of its proper divisors (3888523).

26401781 is a wasteful number, since it uses less digits than its factorization.

26401781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14611.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 26401781 is about 5138.2663418706. The cubic root of 26401781 is about 297.7678063056.

The spelling of 26401781 in words is "twenty-six million, four hundred one thousand, seven hundred eighty-one".