22478013 has 8 divisors (see below), whose sum is σ = 33300800. Its totient is φ = 14985324.

The previous prime is 22478003. The next prime is 22478023. The reversal of 22478013 is 31087422.

It is an interprime number because it is at equal distance from previous prime (22478003) and next prime (22478023).

It is not a de Polignac number, because 22478013 - 2¹⁰ = 22476989 is a prime.

It is a super-2 number, since 2×22478013² = 1010522136856338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 832519 = 22478013 / (2 + 2 + 4 + 7 + 8 + 0 + 1 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22478003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 416233 + ... + 416286.

It is an arithmetic number, because the mean of its divisors is an integer number (4162600).

Almost surely, 2^22478013 is an apocalyptic number.

It is an amenable number.

22478013 is a deficient number, since it is larger than the sum of its proper divisors (10822787).

22478013 is an equidigital number, since it uses as much as digits as its factorization.

22478013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832528 (or 832522 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 22478013 is about 4741.0982904808. The cubic root of 22478013 is about 282.2188206535.

The spelling of 22478013 in words is "twenty-two million, four hundred seventy-eight thousand, thirteen".