1645764324 has 12 divisors (see below), whose sum is σ = 3840116784. Its totient is φ = 548588104.

The previous prime is 1645764319. The next prime is 1645764383. The reversal of 1645764324 is 4234675461.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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, 68573502 + ... + 68573525.

It is an arithmetic number, because the mean of its divisors is an integer number (320009732).

Almost surely, 2^1645764324 is an apocalyptic number.

It is an amenable number.

1645764324 is an abundant number, since it is smaller than the sum of its proper divisors (2194352460).

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

1645764324 is a wasteful number, since it uses less digits than its factorization.

1645764324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137147034 (or 137147032 counting only the distinct ones).

The product of its digits is 483840, while the sum is 42.

The square root of 1645764324 is about 40568.0209524694. The cubic root of 1645764324 is about 1180.6537419326.

The spelling of 1645764324 in words is "one billion, six hundred forty-five million, seven hundred sixty-four thousand, three hundred twenty-four".