22280978 has 4 divisors (see below), whose sum is σ = 33421470. Its totient is φ = 11140488.

The previous prime is 22280963. The next prime is 22280981. The reversal of 22280978 is 87908222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19298449 + 2982529 = 4393^2 + 1727^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5570243 + ... + 5570246.

Almost surely, 2^22280978 is an apocalyptic number.

22280978 is a deficient number, since it is larger than the sum of its proper divisors (11140492).

22280978 is a wasteful number, since it uses less digits than its factorization.

22280978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11140491.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 22280978 is about 4720.2730853204. The cubic root of 22280978 is about 281.3917864187.

The spelling of 22280978 in words is "twenty-two million, two hundred eighty thousand, nine hundred seventy-eight".