1664124420 has 48 divisors (see below), whose sum is σ = 5325199488. Its totient is φ = 380371200.

The previous prime is 1664124419. The next prime is 1664124421. The reversal of 1664124420 is 244214661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1664124419) and next prime (1664124421).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1664124421) 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, 1980681 + ... + 1981520.

It is an arithmetic number, because the mean of its divisors is an integer number (110941656).

Almost surely, 2^1664124420 is an apocalyptic number.

1664124420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664124420 is an abundant number, since it is smaller than the sum of its proper divisors (3661075068).

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

1664124420 is a wasteful number, since it uses less digits than its factorization.

1664124420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962220 (or 3962218 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 1664124420 is about 40793.6811283316. The cubic root of 1664124420 is about 1185.0279613833.

The spelling of 1664124420 in words is "one billion, six hundred sixty-four million, one hundred twenty-four thousand, four hundred twenty".