26640042 has 64 divisors (see below), whose sum is σ = 63745920. Its totient is φ = 7315200.

The previous prime is 26640041. The next prime is 26640073. The reversal of 26640042 is 24004662.

It is a junction number, because it is equal to n+sod(n) for n = 26639994 and 26640021.

It is not an unprimeable number, because it can be changed into a prime (26640041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52084 + ... + 52592.

It is an arithmetic number, because the mean of its divisors is an integer number (996030).

Almost surely, 2^26640042 is an apocalyptic number.

26640042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 26640042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31872960).

26640042 is an abundant number, since it is smaller than the sum of its proper divisors (37105878).

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

26640042 is a wasteful number, since it uses less digits than its factorization.

26640042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 26640042 is about 5161.3992288913. The cubic root of 26640042 is about 298.6608534047.

The spelling of 26640042 in words is "twenty-six million, six hundred forty thousand, forty-two".