22780913 has 6 divisors (see below), whose sum is σ = 23033814. Its totient is φ = 22529024.

The previous prime is 22780889. The next prime is 22780931. The reversal of 22780913 is 31908722.

It can be written as a sum of positive squares in 3 ways, for example, as 719104 + 22061809 = 848^2 + 4697^2 .

It is not a de Polignac number, because 22780913 - 2⁸ = 22780657 is a prime.

It is a super-2 number, since 2×22780913² = 1037939994227138, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22780913.

It is not an unprimeable number, because it can be changed into a prime (22780973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50513 + ... + 50961.

It is an arithmetic number, because the mean of its divisors is an integer number (3838969).

Almost surely, 2^22780913 is an apocalyptic number.

It is an amenable number.

22780913 is a deficient number, since it is larger than the sum of its proper divisors (252901).

22780913 is an frugal number, since it uses more digits than its factorization.

22780913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011 (or 562 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 22780913 is about 4772.9354699179. The cubic root of 22780913 is about 283.4808383811.

The spelling of 22780913 in words is "twenty-two million, seven hundred eighty thousand, nine hundred thirteen".