26217978 has 32 divisors (see below), whose sum is σ = 57029184. Its totient is φ = 8001792.

The previous prime is 26217973. The next prime is 26217991. The reversal of 26217978 is 87971262.

It is not an unprimeable number, because it can be changed into a prime (26217973) 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, 301 + ... + 7247.

It is an arithmetic number, because the mean of its divisors is an integer number (1782162).

Almost surely, 2^26217978 is an apocalyptic number.

26217978 is an abundant number, since it is smaller than the sum of its proper divisors (30811206).

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

26217978 is a wasteful number, since it uses less digits than its factorization.

26217978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7006.

The product of its digits is 84672, while the sum is 42.

The square root of 26217978 is about 5120.3494021404. The cubic root of 26217978 is about 297.0752000398.

The spelling of 26217978 in words is "twenty-six million, two hundred seventeen thousand, nine hundred seventy-eight".