22729644 has 36 divisors (see below), whose sum is σ = 65664144. Its totient is φ = 6494112.

The previous prime is 22729631. The next prime is 22729657. The reversal of 22729644 is 44692722.

22729644 is a `hidden beast` number, since 2 + 2 + 7 + 2 + 9 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (22729631) and next prime (22729657).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 22729599 and 22729608.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44847 + ... + 45350.

It is an arithmetic number, because the mean of its divisors is an integer number (1824004).

Almost surely, 2^22729644 is an apocalyptic number.

It is an amenable number.

22729644 is an abundant number, since it is smaller than the sum of its proper divisors (42934500).

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

22729644 is a wasteful number, since it uses less digits than its factorization.

22729644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90214 (or 90209 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 22729644 is about 4767.5616409230. The cubic root of 22729644 is about 283.2680184701.

The spelling of 22729644 in words is "twenty-two million, seven hundred twenty-nine thousand, six hundred forty-four".