26631978 has 32 divisors (see below), whose sum is σ = 54250560. Its totient is φ = 8714880.

The previous prime is 26631973. The next prime is 26632003. The reversal of 26631978 is 87913662.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (26631973) 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, 147048 + ... + 147228.

It is an arithmetic number, because the mean of its divisors is an integer number (1695330).

Almost surely, 2^26631978 is an apocalyptic number.

26631978 is an abundant number, since it is smaller than the sum of its proper divisors (27618582).

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

26631978 is a wasteful number, since it uses less digits than its factorization.

26631978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502.

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

The square root of 26631978 is about 5160.6179862493. The cubic root of 26631978 is about 298.6307152619.

The spelling of 26631978 in words is "twenty-six million, six hundred thirty-one thousand, nine hundred seventy-eight".