1223578890 has 24 divisors (see below), whose sum is σ = 3181305348. Its totient is φ = 326287680.

The previous prime is 1223578877. The next prime is 1223578913. The reversal of 1223578890 is 988753221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1222131681 + 1447209 = 34959^2 + 1203^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6797571 + ... + 6797750.

Almost surely, 2^1223578890 is an apocalyptic number.

1223578890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1223578890 is an abundant number, since it is smaller than the sum of its proper divisors (1957726458).

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

1223578890 is a wasteful number, since it uses less digits than its factorization.

1223578890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13595334 (or 13595331 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1223578890 is about 34979.6925372422. The cubic root of 1223578890 is about 1069.5735599428.

It can be divided in two parts, 12235 and 78890, that added together give a cube (91125 = 45³).

The spelling of 1223578890 in words is "one billion, two hundred twenty-three million, five hundred seventy-eight thousand, eight hundred ninety".