900022778 has 8 divisors (see below), whose sum is σ = 1350254772. Its totient is φ = 449937856.

The previous prime is 900022777. The next prime is 900022841. The reversal of 900022778 is 877220009.

It can be written as a sum of positive squares in 2 ways, for example, as 880724329 + 19298449 = 29677^2 + 4393^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (900022771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19925 + ... + 46872.

Almost surely, 2^900022778 is an apocalyptic number.

900022778 is a deficient number, since it is larger than the sum of its proper divisors (450231994).

900022778 is a wasteful number, since it uses less digits than its factorization.

900022778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73536.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 900022778 is about 30000.3796309313. The cubic root of 900022778 is about 965.4975296914.

The spelling of 900022778 in words is "nine hundred million, twenty-two thousand, seven hundred seventy-eight".