22245778 has 4 divisors (see below), whose sum is σ = 33368670. Its totient is φ = 11122888.

The previous prime is 22245767. The next prime is 22245779. The reversal of 22245778 is 87754222.

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., 13227769 + 9018009 = 3637^2 + 3003^2 .

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (22245779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561443 + ... + 5561446.

Almost surely, 2^22245778 is an apocalyptic number.

22245778 is a deficient number, since it is larger than the sum of its proper divisors (11122892).

22245778 is a wasteful number, since it uses less digits than its factorization.

22245778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11122891.

The product of its digits is 62720, while the sum is 37.

The square root of 22245778 is about 4716.5430136913. The cubic root of 22245778 is about 281.2435252501.

It can be divided in two parts, 22 and 245778, that multiplied together give a triangular number (5407116 = T₃₂₈₈).

The spelling of 22245778 in words is "twenty-two million, two hundred forty-five thousand, seven hundred seventy-eight".