1645226352 has 540 divisors, whose sum is σ = 6159168288. Its totient is φ = 408038400.

The previous prime is 1645226333. The next prime is 1645226353. The reversal of 1645226352 is 2536225461.

1645226352 is a `hidden beast` number, since 1 + 645 + 2 + 2 + 6 + 3 + 5 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645226353) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 35004793 + ... + 35004839.

Almost surely, 2^1645226352 is an apocalyptic number.

1645226352 is a gapful number since it is divisible by the number (12) 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 1645226352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3079584144).

1645226352 is an abundant number, since it is smaller than the sum of its proper divisors (4513941936).

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

1645226352 is a wasteful number, since it uses less digits than its factorization.

1645226352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 111 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

The square root of 1645226352 is about 40561.3899170134. The cubic root of 1645226352 is about 1180.5250827911.

The spelling of 1645226352 in words is "one billion, six hundred forty-five million, two hundred twenty-six thousand, three hundred fifty-two".