1223642664 has 48 divisors (see below), whose sum is σ = 3420942720. Its totient is φ = 394722720.

The previous prime is 1223642657. The next prime is 1223642669. The reversal of 1223642664 is 4662463221.

1223642664 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 642 + 6 + 6 + 4 = 666.

It is a super-2 number, since 2×1223642664² = 2994602738322033792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1223642669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271882 + ... + 276345.

It is an arithmetic number, because the mean of its divisors is an integer number (71269640).

Almost surely, 2^1223642664 is an apocalyptic number.

It is an amenable number.

1223642664 is an abundant number, since it is smaller than the sum of its proper divisors (2197300056).

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

1223642664 is a wasteful number, since it uses less digits than its factorization.

1223642664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548270 (or 548263 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The square root of 1223642664 is about 34980.6041114215. The cubic root of 1223642664 is about 1069.5921419892.

The spelling of 1223642664 in words is "one billion, two hundred twenty-three million, six hundred forty-two thousand, six hundred sixty-four".