22778040 has 32 divisors (see below), whose sum is σ = 68334480. Its totient is φ = 6074112.

The previous prime is 22778039. The next prime is 22778047. The reversal of 22778040 is 4087722.

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 = 22777989 and 22778007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22778047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94789 + ... + 95028.

Almost surely, 2^22778040 is an apocalyptic number.

22778040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22778040 is an abundant number, since it is smaller than the sum of its proper divisors (45556440).

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

22778040 is a wasteful number, since it uses less digits than its factorization.

22778040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189831 (or 189827 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 22778040 is about 4772.6344926047. The cubic root of 22778040 is about 283.4689208797.

The spelling of 22778040 in words is "twenty-two million, seven hundred seventy-eight thousand, forty".