26421645 has 16 divisors (see below), whose sum is σ = 42433920. Its totient is φ = 14038464.

The previous prime is 26421643. The next prime is 26421649. The reversal of 26421645 is 54612462.

It is not a de Polignac number, because 26421645 - 2¹ = 26421643 is a prime.

It is a super-3 number, since 3×26421645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26421643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 976 + ... + 7334.

It is an arithmetic number, because the mean of its divisors is an integer number (2652120).

Almost surely, 2^26421645 is an apocalyptic number.

It is an amenable number.

26421645 is a deficient number, since it is larger than the sum of its proper divisors (16012275).

26421645 is a wasteful number, since it uses less digits than its factorization.

26421645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6644.

The product of its digits is 11520, while the sum is 30.

The square root of 26421645 is about 5140.1989261117. The cubic root of 26421645 is about 297.8424651191.

The spelling of 26421645 in words is "twenty-six million, four hundred twenty-one thousand, six hundred forty-five".