26990145 has 80 divisors (see below), whose sum is σ = 59406720. Its totient is φ = 11389248.

The previous prime is 26990143. The next prime is 26990147. The reversal of 26990145 is 54109962.

It is an interprime number because it is at equal distance from previous prime (26990143) and next prime (26990147).

It is not a de Polignac number, because 26990145 - 2¹ = 26990143 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26990143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2076159 + ... + 2076171.

It is an arithmetic number, because the mean of its divisors is an integer number (742584).

Almost surely, 2^26990145 is an apocalyptic number.

It is an amenable number.

26990145 is an abundant number, since it is smaller than the sum of its proper divisors (32416575).

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

26990145 is an frugal number, since it uses more digits than its factorization.

26990145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 26990145 is about 5195.2040383415. The cubic root of 26990145 is about 299.9634955583.

The spelling of 26990145 in words is "twenty-six million, nine hundred ninety thousand, one hundred forty-five".