22277640 has 128 divisors (see below), whose sum is σ = 83358720. Its totient is φ = 4627200.

The previous prime is 22277621. The next prime is 22277657. The reversal of 22277640 is 4677222.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 22277598 and 22277607.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8035 + ... + 10445.

It is an arithmetic number, because the mean of its divisors is an integer number (651240).

Almost surely, 2^22277640 is an apocalyptic number.

22277640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22277640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41679360).

22277640 is an abundant number, since it is smaller than the sum of its proper divisors (61081080).

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

22277640 is a wasteful number, since it uses less digits than its factorization.

22277640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2443 (or 2439 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 30.

The square root of 22277640 is about 4719.9194908388. The cubic root of 22277640 is about 281.3777335842.

The spelling of 22277640 in words is "twenty-two million, two hundred seventy-seven thousand, six hundred forty".