26221765 has 16 divisors (see below), whose sum is σ = 32252400. Its totient is φ = 20459520.

The previous prime is 26221757. The next prime is 26221781. The reversal of 26221765 is 56712262.

It can be written as a sum of positive squares in 8 ways, for example, as 1481089 + 24740676 = 1217^2 + 4974^2 .

It is not a de Polignac number, because 26221765 - 2³ = 26221757 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45157 + ... + 45733.

It is an arithmetic number, because the mean of its divisors is an integer number (2015775).

Almost surely, 2^26221765 is an apocalyptic number.

It is an amenable number.

26221765 is a deficient number, since it is larger than the sum of its proper divisors (6030635).

26221765 is a wasteful number, since it uses less digits than its factorization.

26221765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its digits is 10080, while the sum is 31.

The square root of 26221765 is about 5120.7191877704. The cubic root of 26221765 is about 297.0895028160.

The spelling of 26221765 in words is "twenty-six million, two hundred twenty-one thousand, seven hundred sixty-five".