26649840 has 160 divisors (see below), whose sum is σ = 97850880. Its totient is φ = 5870592.

The previous prime is 26649793. The next prime is 26649871. The reversal of 26649840 is 4894662.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48447 + ... + 48993.

It is an arithmetic number, because the mean of its divisors is an integer number (611568).

Almost surely, 2^26649840 is an apocalyptic number.

26649840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26649840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48925440).

26649840 is an abundant number, since it is smaller than the sum of its proper divisors (71201040).

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

26649840 is a wasteful number, since it uses less digits than its factorization.

26649840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599 (or 593 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 26649840 is about 5162.3483028560. The cubic root of 26649840 is about 298.6974639621.

The spelling of 26649840 in words is "twenty-six million, six hundred forty-nine thousand, eight hundred forty".