26321640 has 64 divisors (see below), whose sum is σ = 79306560. Its totient is φ = 6988800.

The previous prime is 26321623. The next prime is 26321651. The reversal of 26321640 is 4612362.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 26321640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47847 + ... + 48393.

It is an arithmetic number, because the mean of its divisors is an integer number (1239165).

Almost surely, 2^26321640 is an apocalyptic number.

26321640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26321640 is an abundant number, since it is smaller than the sum of its proper divisors (52984920).

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

26321640 is a wasteful number, since it uses less digits than its factorization.

26321640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962 (or 958 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 26321640 is about 5130.4619675035. The cubic root of 26321640 is about 297.4662155925.

The spelling of 26321640 in words is "twenty-six million, three hundred twenty-one thousand, six hundred forty".