1144664420 has 12 divisors (see below), whose sum is σ = 2403795324. Its totient is φ = 457865760.

The previous prime is 1144664419. The next prime is 1144664431. The reversal of 1144664420 is 244664411.

It can be written as a sum of positive squares in 2 ways, for example, as 682672384 + 461992036 = 26128^2 + 21494^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28616591 + ... + 28616630.

It is an arithmetic number, because the mean of its divisors is an integer number (200316277).

Almost surely, 2^1144664420 is an apocalyptic number.

1144664420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1144664420 is an abundant number, since it is smaller than the sum of its proper divisors (1259130904).

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

1144664420 is a wasteful number, since it uses less digits than its factorization.

1144664420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57233230 (or 57233228 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 1144664420 is about 33832.8896194221. The cubic root of 1144664420 is about 1046.0667418633.

Subtracting from 1144664420 its reverse (244664411), we obtain a palindrome (900000009).

The spelling of 1144664420 in words is "one billion, one hundred forty-four million, six hundred sixty-four thousand, four hundred twenty".