26613978 has 8 divisors (see below), whose sum is σ = 53227968. Its totient is φ = 8871324.

The previous prime is 26613973. The next prime is 26613997. The reversal of 26613978 is 87931662.

It is a happy number.

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

26613978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (26613971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2217826 + ... + 2217837.

It is an arithmetic number, because the mean of its divisors is an integer number (6653496).

Almost surely, 2^26613978 is an apocalyptic number.

26613978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

26613978 is a wasteful number, since it uses less digits than its factorization.

26613978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4435668.

The product of its digits is 108864, while the sum is 42.

The square root of 26613978 is about 5158.8737142907. The cubic root of 26613978 is about 298.5634206689.

The spelling of 26613978 in words is "twenty-six million, six hundred thirteen thousand, nine hundred seventy-eight".