1764400228 has 6 divisors (see below), whose sum is σ = 3087700406. Its totient is φ = 882200112.

The previous prime is 1764400207. The next prime is 1764400229. The reversal of 1764400228 is 8220044671.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1649009664 + 115390564 = 40608^2 + 10742^2 .

It is a super-2 number, since 2×1764400228² = 6226216329132903968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1764400193 and 1764400202.

It is not an unprimeable number, because it can be changed into a prime (1764400229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220550025 + ... + 220550032.

Almost surely, 2^1764400228 is an apocalyptic number.

It is an amenable number.

1764400228 is a deficient number, since it is larger than the sum of its proper divisors (1323300178).

1764400228 is a wasteful number, since it uses less digits than its factorization.

1764400228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441100061 (or 441100059 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 1764400228 is about 42004.7643488212. The cubic root of 1764400228 is about 1208.3674972483.

Adding to 1764400228 its reverse (8220044671), we get a palindrome (9984444899).

The spelling of 1764400228 in words is "one billion, seven hundred sixty-four million, four hundred thousand, two hundred twenty-eight".