22064781 has 4 divisors (see below), whose sum is σ = 29419712. Its totient is φ = 14709852.

The previous prime is 22064773. The next prime is 22064807. The reversal of 22064781 is 18746022.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 22064781 - 2³ = 22064773 is a prime.

It is a super-2 number, since 2×22064781² = 973709121155922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22064701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3677461 + ... + 3677466.

It is an arithmetic number, because the mean of its divisors is an integer number (7354928).

Almost surely, 2^22064781 is an apocalyptic number.

It is an amenable number.

22064781 is a deficient number, since it is larger than the sum of its proper divisors (7354931).

22064781 is an equidigital number, since it uses as much as digits as its factorization.

22064781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7354930.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 22064781 is about 4697.3163614983. The cubic root of 22064781 is about 280.4786922087.

The spelling of 22064781 in words is "twenty-two million, sixty-four thousand, seven hundred eighty-one".