1645652484 has 384 divisors, whose sum is σ = 5449973760. Its totient is φ = 419126400.

The previous prime is 1645652471. The next prime is 1645652539. The reversal of 1645652484 is 4842565461.

It is a happy number.

1645652484 is a `hidden beast` number, since 1 + 6 + 4 + 565 + 2 + 4 + 84 = 666.

Its product of digits (921600) is a multiple of the sum of its prime divisors (180).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23178169 + ... + 23178239.

It is an arithmetic number, because the mean of its divisors is an integer number (14192640).

Almost surely, 2^1645652484 is an apocalyptic number.

1645652484 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1645652484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2724986880).

1645652484 is an abundant number, since it is smaller than the sum of its proper divisors (3804321276).

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

1645652484 is a wasteful number, since it uses less digits than its factorization.

1645652484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188 (or 180 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The square root of 1645652484 is about 40566.6425034165. The cubic root of 1645652484 is about 1180.6269970530.

Adding to 1645652484 its product of digits (921600), we get a square (1646574084 = 40578²).

The spelling of 1645652484 in words is "one billion, six hundred forty-five million, six hundred fifty-two thousand, four hundred eighty-four".