1780222890 has 32 divisors (see below), whose sum is σ = 4280164416. Its totient is φ = 473878400.

The previous prime is 1780222889. The next prime is 1780222891. The reversal of 1780222890 is 982220871.

It is an interprime number because it is at equal distance from previous prime (1780222889) and next prime (1780222891).

It is not an unprimeable number, because it can be changed into a prime (1780222891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35811 + ... + 69590.

It is an arithmetic number, because the mean of its divisors is an integer number (133755138).

Almost surely, 2^1780222890 is an apocalyptic number.

1780222890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1780222890 is an abundant number, since it is smaller than the sum of its proper divisors (2499941526).

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

1780222890 is a wasteful number, since it uses less digits than its factorization.

1780222890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105974.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 1780222890 is about 42192.6876366036. The cubic root of 1780222890 is about 1211.9688571004.

The spelling of 1780222890 in words is "one billion, seven hundred eighty million, two hundred twenty-two thousand, eight hundred ninety".