26616645 has 48 divisors (see below), whose sum is σ = 53307072. Its totient is φ = 12142080.

The previous prime is 26616641. The next prime is 26616649. The reversal of 26616645 is 54661662.

It is a happy number.

26616645 is a `hidden beast` number, since 2 + 6 + 6 + 1 + 6 + 645 = 666.

It is an interprime number because it is at equal distance from previous prime (26616641) and next prime (26616649).

It is not a de Polignac number, because 26616645 - 2² = 26616641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26616641) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 6834 + ... + 9996.

It is an arithmetic number, because the mean of its divisors is an integer number (1110564).

Almost surely, 2^26616645 is an apocalyptic number.

It is an amenable number.

26616645 is an abundant number, since it is smaller than the sum of its proper divisors (26690427).

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

26616645 is a wasteful number, since it uses less digits than its factorization.

26616645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202 (or 3199 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 26616645 is about 5159.1321944684. The cubic root of 26616645 is about 298.5733933988.

It can be divided in two parts, 26616 and 645, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 26616645 in words is "twenty-six million, six hundred sixteen thousand, six hundred forty-five".