1645378332 has 24 divisors (see below), whose sum is σ = 4134540816. Its totient is φ = 506270208.

The previous prime is 1645378297. The next prime is 1645378349. The reversal of 1645378332 is 2338735461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5273493 + ... + 5273804.

It is an arithmetic number, because the mean of its divisors is an integer number (172272534).

Almost surely, 2^1645378332 is an apocalyptic number.

1645378332 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1645378332 is an abundant number, since it is smaller than the sum of its proper divisors (2489162484).

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

1645378332 is a wasteful number, since it uses less digits than its factorization.

1645378332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10547317 (or 10547315 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 1645378332 is about 40563.2633302598. The cubic root of 1645378332 is about 1180.5614325366.

The spelling of 1645378332 in words is "one billion, six hundred forty-five million, three hundred seventy-eight thousand, three hundred thirty-two".